Asset Acrobatics City is made by Asset Acrobatics, a private, non-commercial project.
Unreal Engine
Asset Acrobatics City uses Unreal Engine. Unreal is a trademark or registered trademark of Epic Games, Inc. in the United States of America and elsewhere.
Unreal® Engine, Copyright 1998 – 2026, Epic Games, Inc. All rights reserved.
Content and asset packs
The game uses no art packs yet, but its data files do hold third-party fonts and data that come with Unreal Engine. The fonts are Roboto and Droid Sans Fallback (Apache License, Version 2.0), Noto Naskh Arabic UI and Noto Sans Thai (SIL Open Font License, Version 1.1), and Droid Sans Mono, whose licence is not settled (see item 6 of GAPS, the last section of the notices below). The data are the lookup tables of the engine's glint shading (MIT License), of its sheen shading (Apache License, Version 2.0) and of its SMAA anti-aliasing (MIT License), three blue-noise textures whose source and licence are not established yet (item 8 of GAPS), and two settings assets of the Animation Compression Library plugin (MIT License; item 1 of GAPS). Section 12 of the notices below gives the copyright lines and licences of the fonts and lookup tables; the text of the Apache License is in section 6. When a pack is added, its credit and licence go here.
Third-party software
The game's web runtime, that is its WebAssembly program, the JavaScript around it and the page that loads them, contains open-source software by other authors, among them FreeType, Dawn (emdawnwebgpu), Emscripten with musl libc, LLVM's libc++, libc++abi and compiler-rt, zlib, Opus, libpng and BLAKE3. Their copyright notices and licence texts follow, with those of the fonts and lookup tables above. The list is not complete yet: its last section, GAPS, names further third-party code in the game's program and its compiled shaders, whose licence texts are still to be added, and the points still open, among them the licence of one font, the source of three textures and a check of the Unreal Engine lines above against Epic's current licence.
Plain-text copy: THIRD-PARTY-NOTICES.txt. The same file ships with the game, at the root of its site: city.assetacrobatics.com/THIRD-PARTY-NOTICES.txt.
THIRD-PARTY NOTICES
Asset Acrobatics City: the Unreal Engine web runtime of this game
Version 1, 2026-11-12.
This file holds the copyright notices and licence texts of the third-party software in the Unreal Engine web
runtime of this game (the WebAssembly binary, its JavaScript glue and the page that loads them) and of the
third-party fonts and data that come with the engine in the game's data files (section 12). Further third-party
code, in the binary and in the game's compiled shaders, and the points still open are listed under GAPS; the
code's licence texts are still to be added.
On the game's site, the short NOTICES.txt beside this file is the one line Unreal Engine stages by itself; this
file is the full text. The game's own content and any asset packs are credited on the Credits page of
www.assetacrobatics.com, not here.
Built with Unreal Engine 5.9 Preview 1 (CL 60351404) and emscripten 6.0.10. Each section names the file its text
was copied from. Copies are exact except: line endings, the "// " comment markers of the Dawn and glint texts
(their files are C++ and shader comments), and non-ASCII characters written in ASCII ((c) for the copyright sign,
(R) for the registered sign, plain letters for accented ones, - for the en dash).
Contents
1. Unreal Engine (Epic Games, Inc.)
2. FreeType 2.14.1
3. Dawn: emdawnwebgpu (WebGPU for emscripten)
4. Emscripten 6.0.10: JavaScript runtime and system libraries
5. musl libc (in emscripten)
6. LLVM libc++, libc++abi and compiler-rt (in emscripten)
7. zlib 1.3
8. Opus 1.1
9. libpng 1.6.44
10. BLAKE3 1.3.1
11. Epic components (no third-party notice)
12. Fonts and lookup tables that come with Unreal Engine
GAPS (not yet complete)
==============================================================================
1. Unreal Engine (Epic Games, Inc.)
==============================================================================
What: the engine this game is built with
Licence: Unreal Engine End User License Agreement
Source of the lines: the Unreal Engine EULA, section 6(a), in Epic's PDF of 2022
Asset Acrobatics City uses Unreal Engine. Unreal is a trademark or registered trademark of Epic Games, Inc. in the
United States of America and elsewhere.
Unreal(R) Engine, Copyright 1998 - 2026, Epic Games, Inc. All rights reserved.
==============================================================================
2. FreeType 2.14.1
==============================================================================
What: font rendering, linked into the game (the BDF, PCF, gzip, LZW, SDF and SVG modules included)
Copyright: Copyright (C) 1996-2025 by David Turner, Robert Wilhelm, and Werner Lemberg
Licence: The FreeType Project LICENSE (FTL), which asks for this credit in the documentation
Source of the copyright: UE 5.9 Preview 1: Engine/Source/ThirdParty/FreeType2/FreeType2-2.14.1/include/freetype/freetype.h (its header)
Source of the credit: UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/NOTICES.txt (the line Unreal Engine stages as NOTICES.txt)
Source of fthash: UE 5.9 Preview 1: Engine/Source/ThirdParty/FreeType2/FreeType2-2.14.1/include/freetype/internal/fthash.h (its header)
Portions of this software are copyright (c) The FreeType Project (http://www.freetype.org). All rights reserved.
Portions of this software are copyright (c) 2025 The FreeType Project (https://freetype.org). All rights reserved.
The second line is the credit in the form the FTL asks for, with the year of FreeType 2.14.1 (FTL text:
UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/Freetype2.14.1_License.TXT).
FreeType's hash functions (fthash, taken from its BDF driver) carry their own licence:
/*
* Copyright 2000 Computing Research Labs, New Mexico State University
* Copyright 2001-2015
* Francesco Zappa Nardelli
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COMPUTING RESEARCH LAB OR NEW MEXICO STATE UNIVERSITY BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
* OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
* THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
==============================================================================
3. Dawn: emdawnwebgpu (WebGPU for emscripten)
==============================================================================
What: Dawn's webgpu.h for emscripten (C++ and JavaScript), linked into every web build
Version: Dawn chromium/8059, emdawnwebgpu package
Copyright: Copyright 2017-2025 The Dawn & Tint Authors
Licence: BSD-3-Clause
Source of the text: UE 5.9 Preview 1: Engine/Platforms/Wasm/Build/ThirdParty/emdawnwebgpu/webgpu_cpp/LICENSE (comment markers dropped)
Copyright 2017-2025 The Dawn & Tint Authors
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Its JavaScript bindings (webgpu/src) are a fork of emscripten's WebGPU bindings, under emscripten's MIT and
University of Illinois/NCSA licences: Copyright (c) 2010-2014 Emscripten authors. Their licence file,
UE 5.9 Preview 1: Engine/Platforms/Wasm/Build/ThirdParty/emdawnwebgpu/webgpu/src/LICENSE,
is the first part of the emscripten text in section 4 (everything before its Node.js note).
==============================================================================
4. Emscripten 6.0.10: JavaScript runtime and system libraries
==============================================================================
What: the JavaScript runtime and emscripten's system libraries (its parts of the C library, the emmalloc
allocator, WasmFS and the others it links); in every web build
Version: emscripten 6.0.10 (d6c521a7f054)
Copyright: Copyright (c) 2010-2014 Emscripten authors, see AUTHORS file
Licence: MIT and University of Illinois/NCSA (dual)
Source of the text: emsdk 6.0.10: upstream/emscripten/LICENSE
Emscripten is available under 2 licenses, the MIT license and the
University of Illinois/NCSA Open Source License.
Both are permissive open source licenses, with little if any
practical difference between them.
The reason for offering both is that (1) the MIT license is
well-known, while (2) the University of Illinois/NCSA Open Source
License allows Emscripten's code to be integrated upstream into
LLVM, which uses that license, should the opportunity arise.
The full text of both licenses follows.
==============================================================================
Copyright (c) 2010-2014 Emscripten authors, see AUTHORS file.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
==============================================================================
Copyright (c) 2010-2014 Emscripten authors, see AUTHORS file.
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal with the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimers.
Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimers
in the documentation and/or other materials provided with the
distribution.
Neither the names of Mozilla,
nor the names of its contributors may be used to endorse
or promote products derived from this Software without specific prior
written permission.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
==============================================================================
This program uses portions of Node.js source code located in src/library_path.js,
in accordance with the terms of the MIT license. Node's license follows:
"""
Copyright Joyent, Inc. and other Node contributors. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
"""
The musl libc project is bundled in this repo, and it has the MIT license, see
system/lib/libc/musl/COPYRIGHT
The third_party/ subdirectory contains code with other licenses. None of it is
used by default, but certain options use it (e.g., the optional closure compiler
flag will run closure compiler from third_party/).
The WasmFS fetch backend in every web build is emscripten's src/lib/libwasmfs_fetch.js, modified by Epic Games,
Inc. (the changes are listed in the file's header), under the MIT licence above. Its notice reads
"Copyright 2022 The Emscripten Authors" and "SPDX-License-Identifier: MIT" (UE 5.9 Preview 1: Engine/Platforms/Wasm/Build/Link/wasmfs_fetch.js (its header)).
==============================================================================
5. musl libc (in emscripten)
==============================================================================
What: the C library emscripten builds its own from; linked into every web build
Copyright: Copyright (c) 2005-2020 Rich Felker, et al.
Licence: MIT
Source of the text: emsdk 6.0.10: upstream/emscripten/system/lib/libc/musl/COPYRIGHT
musl as a whole is licensed under the following standard MIT license:
----------------------------------------------------------------------
Copyright (c) 2005-2020 Rich Felker, et al.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
----------------------------------------------------------------------
Authors/contributors include:
A. Wilcox
Ada Worcester
Alex Dowad
Alex Suykov
Alexander Monakov
Andre McCurdy
Andrew Kelley
Anthony G. Basile
Aric Belsito
Arvid Picciani
Bartosz Brachaczek
Benjamin Peterson
Bobby Bingham
Boris Brezillon
Brent Cook
Chris Spiegel
Clement Vasseur
Daniel Micay
Daniel Sabogal
Daurnimator
David Carlier
David Edelsohn
Denys Vlasenko
Dmitry Ivanov
Dmitry V. Levin
Drew DeVault
Emil Renner Berthing
Fangrui Song
Felix Fietkau
Felix Janda
Gianluca Anzolin
Hauke Mehrtens
He X
Hiltjo Posthuma
Isaac Dunham
Jaydeep Patil
Jens Gustedt
Jeremy Huntwork
Jo-Philipp Wich
Joakim Sindholt
John Spencer
Julien Ramseier
Justin Cormack
Kaarle Ritvanen
Khem Raj
Kylie McClain
Leah Neukirchen
Luca Barbato
Luka Perkov
Lynn Ochs
M Farkas-Dyck (Strake)
Mahesh Bodapati
Markus Wichmann
Masanori Ogino
Michael Clark
Michael Forney
Mikhail Kremnyov
Natanael Copa
Nicholas J. Kain
orc
Pascal Cuoq
Patrick Oppenlander
Petr Hosek
Petr Skocik
Pierre Carrier
Reini Urban
Rich Felker
Richard Pennington
Ryan Fairfax
Samuel Holland
Segev Finer
Shiz
sin
Solar Designer
Stefan Kristiansson
Stefan O'Rear
Szabolcs Nagy
Timo Teras
Trutz Behn
Will Dietz
William Haddon
William Pitcock
Portions of this software are derived from third-party works licensed
under terms compatible with the above MIT license:
The TRE regular expression implementation (src/regex/reg* and
src/regex/tre*) is Copyright (c) 2001-2008 Ville Laurikari and licensed
under a 2-clause BSD license (license text in the source files). The
included version has been heavily modified by Rich Felker in 2012, in
the interests of size, simplicity, and namespace cleanliness.
Much of the math library code (src/math/* and src/complex/*) is
Copyright (c) 1993,2004 Sun Microsystems or
Copyright (c) 2003-2011 David Schultz or
Copyright (c) 2003-2009 Steven G. Kargl or
Copyright (c) 2003-2009 Bruce D. Evans or
Copyright (c) 2008 Stephen L. Moshier or
Copyright (c) 2017-2018 Arm Limited
and labelled as such in comments in the individual source files. All
have been licensed under extremely permissive terms.
The ARM memcpy code (src/string/arm/memcpy.S) is Copyright (c) 2008
The Android Open Source Project and is licensed under a two-clause BSD
license. It was taken from Bionic libc, used on Android.
The AArch64 memcpy and memset code (src/string/aarch64/*) are
Copyright (c) 1999-2019, Arm Limited.
The implementation of DES for crypt (src/crypt/crypt_des.c) is
Copyright (c) 1994 David Burren. It is licensed under a BSD license.
The implementation of blowfish crypt (src/crypt/crypt_blowfish.c) was
originally written by Solar Designer and placed into the public
domain. The code also comes with a fallback permissive license for use
in jurisdictions that may not recognize the public domain.
The smoothsort implementation (src/stdlib/qsort.c) is Copyright (c) 2011
Lynn Ochs and is licensed under an MIT-style license.
The x86_64 port was written by Nicholas J. Kain and is licensed under
the standard MIT terms.
The mips and microblaze ports were originally written by Richard
Pennington for use in the ellcc project. The original code was adapted
by Rich Felker for build system and code conventions during upstream
integration. It is licensed under the standard MIT terms.
The mips64 port was contributed by Imagination Technologies and is
licensed under the standard MIT terms.
The powerpc port was also originally written by Richard Pennington,
and later supplemented and integrated by John Spencer. It is licensed
under the standard MIT terms.
All other files which have no copyright comments are original works
produced specifically for use as part of this library, written either
by Rich Felker, the main author of the library, or by one or more
contibutors listed above. Details on authorship of individual files
can be found in the git version control history of the project. The
omission of copyright and license comments in each file is in the
interest of source tree size.
In addition, permission is hereby granted for all public header files
(include/* and arch/*/bits/*) and crt files intended to be linked into
applications (crt/*, ldso/dlstart.c, and arch/*/crt_arch.h) to omit
the copyright notice and permission notice otherwise required by the
license, and to use these files without any requirement of
attribution. These files include substantial contributions from:
Bobby Bingham
John Spencer
Nicholas J. Kain
Rich Felker
Richard Pennington
Stefan Kristiansson
Szabolcs Nagy
all of whom have explicitly granted such permission.
This file previously contained text expressing a belief that most of
the files covered by the above exception were sufficiently trivial not
to be subject to copyright, resulting in confusion over whether it
negated the permissions granted in the license. In the spirit of
permissive licensing, and of not having licensing issues being an
obstacle to adoption, that text has been removed.
==============================================================================
6. LLVM libc++, libc++abi and compiler-rt (in emscripten)
==============================================================================
What: the C++ standard library, its ABI library and the compiler's runtime builtins; linked into every web build
Licence: Apache-2.0 WITH LLVM-exception; the legacy University of Illinois/NCSA and MIT licences
Sources of the text: emsdk 6.0.10: upstream/emscripten/system/lib/libcxx/LICENSE.TXT
emsdk 6.0.10: upstream/emscripten/system/lib/libcxxabi/LICENSE.TXT
emsdk 6.0.10: upstream/emscripten/system/lib/compiler-rt/LICENSE.TXT
How it is laid out: the three files are the same in lines 1-235 (part A, once); part B is each file's
own lines 236-311, which name the library (and compiler-rt's MIT copyright years)
Part A: lines 1-235 of each of the three files
------------------------------------------------------------------------------
==============================================================================
The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
==============================================================================
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
---- LLVM Exceptions to the Apache 2.0 License ----
As an exception, if, as a result of your compiling your source code, portions
of this Software are embedded into an Object form of such source code, you
may redistribute such embedded portions in such Object form without complying
with the conditions of Sections 4(a), 4(b) and 4(d) of the License.
In addition, if you combine or link compiled forms of this Software with
software that is licensed under the GPLv2 ("Combined Software") and if a
court of competent jurisdiction determines that the patent provision (Section
3), the indemnity provision (Section 9) or other Section of the License
conflicts with the conditions of the GPLv2, you may retroactively and
prospectively choose to deem waived or otherwise exclude such Section(s) of
the License, but only in their entirety and only with respect to the Combined
Software.
==============================================================================
Software from third parties included in the LLVM Project:
==============================================================================
The LLVM Project contains third party software which is under different license
terms. All such code will be identified clearly using at least one of two
mechanisms:
1) It will be in a separate directory tree with its own `LICENSE.txt` or
`LICENSE` file at the top containing the specific license and restrictions
which apply to that software, or
2) It will contain specific license and restriction terms at the top of every
file.
Part B for libc++: lines 236-311 of libcxx/LICENSE.TXT
------------------------------------------------------------------------------
==============================================================================
Legacy LLVM License (https://llvm.org/docs/DeveloperPolicy.html#legacy):
==============================================================================
The libc++ library is dual licensed under both the University of Illinois
"BSD-Like" license and the MIT license. As a user of this code you may choose
to use it under either license. As a contributor, you agree to allow your code
to be used under both.
Full text of the relevant licenses is included below.
==============================================================================
University of Illinois/NCSA
Open Source License
Copyright (c) 2009-2019 by the contributors listed in CREDITS.TXT
All rights reserved.
Developed by:
LLVM Team
University of Illinois at Urbana-Champaign
http://llvm.org
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal with
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimers.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimers in the
documentation and/or other materials provided with the distribution.
* Neither the names of the LLVM Team, University of Illinois at
Urbana-Champaign, nor the names of its contributors may be used to
endorse or promote products derived from this Software without specific
prior written permission.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
SOFTWARE.
==============================================================================
Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Part B for libc++abi: lines 236-311 of libcxxabi/LICENSE.TXT
------------------------------------------------------------------------------
==============================================================================
Legacy LLVM License (https://llvm.org/docs/DeveloperPolicy.html#legacy):
==============================================================================
The libc++abi library is dual licensed under both the University of Illinois
"BSD-Like" license and the MIT license. As a user of this code you may choose
to use it under either license. As a contributor, you agree to allow your code
to be used under both.
Full text of the relevant licenses is included below.
==============================================================================
University of Illinois/NCSA
Open Source License
Copyright (c) 2009-2019 by the contributors listed in CREDITS.TXT
All rights reserved.
Developed by:
LLVM Team
University of Illinois at Urbana-Champaign
http://llvm.org
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal with
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimers.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimers in the
documentation and/or other materials provided with the distribution.
* Neither the names of the LLVM Team, University of Illinois at
Urbana-Champaign, nor the names of its contributors may be used to
endorse or promote products derived from this Software without specific
prior written permission.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
SOFTWARE.
==============================================================================
Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Part B for compiler-rt: lines 236-311 of compiler-rt/LICENSE.TXT
------------------------------------------------------------------------------
==============================================================================
Legacy LLVM License (https://llvm.org/docs/DeveloperPolicy.html#legacy):
==============================================================================
The compiler_rt library is dual licensed under both the University of Illinois
"BSD-Like" license and the MIT license. As a user of this code you may choose
to use it under either license. As a contributor, you agree to allow your code
to be used under both.
Full text of the relevant licenses is included below.
==============================================================================
University of Illinois/NCSA
Open Source License
Copyright (c) 2009-2019 by the contributors listed in CREDITS.TXT
All rights reserved.
Developed by:
LLVM Team
University of Illinois at Urbana-Champaign
http://llvm.org
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal with
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimers.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimers in the
documentation and/or other materials provided with the distribution.
* Neither the names of the LLVM Team, University of Illinois at
Urbana-Champaign, nor the names of its contributors may be used to
endorse or promote products derived from this Software without specific
prior written permission.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
SOFTWARE.
==============================================================================
Copyright (c) 2009-2015 by the contributors listed in CREDITS.TXT
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
==============================================================================
7. zlib 1.3
==============================================================================
What: compression; the engine's zlib 1.3, rebuilt for the web (Engine/Platforms/Wasm/Source/ThirdParty/zlib/
zlib_Wasm.Build.cs; the binary says "deflate 1.3" and "inflate 1.3")
Copyright: Copyright (C) 1995-2023 Jean-loup Gailly and Mark Adler
Licence: zlib
Source of the text: UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/Zlib_License.txt
/* zlib.h -- interface of the 'zlib' general purpose compression library
version 1.3, August 18th, 2023
Copyright (C) 1995-2023 Jean-loup Gailly and Mark Adler
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jean-loup Gailly Mark Adler
jloup@gzip.org madler@alumni.caltech.edu
*/
==============================================================================
8. Opus 1.1
==============================================================================
What: the Opus audio decoder (libopus 1.1), linked for the engine's voice module
Copyright: Copyright 2001-2011 Xiph.Org, Skype Limited, Octasic, Jean-Marc Valin, Timothy B. Terriberry,
CSIRO, Gregory Maxwell, Mark Borgerding, Erik de Castro Lopo
Licence: BSD-3-Clause
Source of the text: UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/Opus_License.txt
Copyright 2001-2011 Xiph.Org, Skype Limited, Octasic,
Jean-Marc Valin, Timothy B. Terriberry,
CSIRO, Gregory Maxwell, Mark Borgerding,
Erik de Castro Lopo
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Internet Society, IETF or IETF Trust, nor the
names of specific contributors, may be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Opus is subject to the royalty-free patent licenses which are
specified at:
Xiph.Org Foundation:
https://datatracker.ietf.org/ipr/1524/
Microsoft Corporation:
https://datatracker.ietf.org/ipr/1914/
Broadcom Corporation:
https://datatracker.ietf.org/ipr/1526/
==============================================================================
9. libpng 1.6.44
==============================================================================
What: PNG image decoding
Copyright: Copyright (c) 1995-2025 The PNG Reference Library Authors, and the others named below
Licence: PNG Reference Library License version 2 (it asks for no notice with binaries; given in full)
Source of the text: UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/libPNG_v1.6.44_License.txt
COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
=========================================
PNG Reference Library License version 2
---------------------------------------
* Copyright (c) 1995-2025 The PNG Reference Library Authors.
* Copyright (c) 2018-2025 Cosmin Truta.
* Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
* Copyright (c) 1996-1997 Andreas Dilger.
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
The software is supplied "as is", without warranty of any kind,
express or implied, including, without limitation, the warranties
of merchantability, fitness for a particular purpose, title, and
non-infringement. In no event shall the Copyright owners, or
anyone distributing the software, be liable for any damages or
other liability, whether in contract, tort or otherwise, arising
from, out of, or in connection with the software, or the use or
other dealings in the software, even if advised of the possibility
of such damage.
Permission is hereby granted to use, copy, modify, and distribute
this software, or portions hereof, for any purpose, without fee,
subject to the following restrictions:
1. The origin of this software must not be misrepresented; you
must not claim that you wrote the original software. If you
use this software in a product, an acknowledgment in the product
documentation would be appreciated, but is not required.
2. Altered source versions must be plainly marked as such, and must
not be misrepresented as being the original software.
3. This Copyright notice may not be removed or altered from any
source or altered source distribution.
PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
-----------------------------------------------------------------------
libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are
Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
derived from libpng-1.0.6, and are distributed according to the same
disclaimer and license as libpng-1.0.6 with the following individuals
added to the list of Contributing Authors:
Simon-Pierre Cadieux
Eric S. Raymond
Mans Rullgard
Cosmin Truta
Gilles Vollant
James Yu
Mandar Sahastrabuddhe
Google Inc.
Vadim Barkov
and with the following additions to the disclaimer:
There is no warranty against interference with your enjoyment of
the library or against infringement. There is no warranty that our
efforts or the library will fulfill any of your particular purposes
or needs. This library is provided with all faults, and the entire
risk of satisfactory quality, performance, accuracy, and effort is
with the user.
Some files in the "contrib" directory and some configure-generated
files that are distributed with libpng have other copyright owners, and
are released under other open source licenses.
libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
libpng-0.96, and are distributed according to the same disclaimer and
license as libpng-0.96, with the following individuals added to the
list of Contributing Authors:
Tom Lane
Glenn Randers-Pehrson
Willem van Schaik
libpng versions 0.89, June 1996, through 0.96, May 1997, are
Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
and are distributed according to the same disclaimer and license as
libpng-0.88, with the following individuals added to the list of
Contributing Authors:
John Bowler
Kevin Bracey
Sam Bushell
Magnus Holmgren
Greg Roelofs
Tom Tanner
Some files in the "scripts" directory have other copyright owners,
but are released under this license.
libpng versions 0.5, May 1995, through 0.88, January 1996, are
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
Andreas Dilger
Dave Martindale
Guy Eric Schalnat
Paul Schmidt
Tim Wegner
The PNG Reference Library is supplied "AS IS". The Contributing
Authors and Group 42, Inc. disclaim all warranties, expressed or
implied, including, without limitation, the warranties of
merchantability and of fitness for any purpose. The Contributing
Authors and Group 42, Inc. assume no liability for direct, indirect,
incidental, special, exemplary, or consequential damages, which may
result from the use of the PNG Reference Library, even if advised of
the possibility of such damage.
Permission is hereby granted to use, copy, modify, and distribute this
source code, or portions hereof, for any purpose, without fee, subject
to the following restrictions:
1. The origin of this source code must not be misrepresented.
2. Altered versions must be plainly marked as such and must not
be misrepresented as being the original source.
3. This Copyright notice may not be removed or altered from any
source or altered source distribution.
The Contributing Authors and Group 42, Inc. specifically permit,
without fee, and encourage the use of this source code as a component
to supporting the PNG file format in commercial products. If you use
this source code in a product, acknowledgment is not required but would
be appreciated.
==============================================================================
10. BLAKE3 1.3.1
==============================================================================
What: the BLAKE3 hash
Licence: CC0 1.0 (public domain dedication), or Apache License 2.0
Used under: CC0 1.0, which asks for no notice; listed for completeness
Source: UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/Blake3_License.txt (its first two lines)
This work is released into the public domain with CC0 1.0. Alternatively, it is
licensed under the Apache License 2.0.
==============================================================================
11. Epic components (no third-party notice)
==============================================================================
What: Oodle Data 2.9.16 (with its SIMD128 overlay), Bink Audio, RAD Audio, the Oodle and Oodle Network stubs
Licence: Epic Games proprietary, under the Unreal Engine EULA (Engine/Platforms/Wasm/Docs/THIRD-PARTY.md)
==============================================================================
12. Fonts and lookup tables that come with Unreal Engine
==============================================================================
What: third-party content from the engine in the game's data files (its .pak and .ucas): the fonts of the
engine's UI framework, Slate (Engine/Content/Slate/Fonts, and one more Roboto Bold in Slate/Old/Tiles),
the font faces of /Engine/EngineFonts/Faces and its distance-field font, and the lookup tables of the
engine's glint and sheen shading and of its SMAA anti-aliasing. Other third-party data in those files: the
two settings assets of the Animation Compression Library plugin (with its code in GAPS 1) and three
blue-noise textures whose source is not established (GAPS 8)
Sources: each font's own name table (its copyright and licence fields), and the files named below
Roboto: 10 font files in Slate/Fonts (Roboto, Roboto Bk, Roboto Cn, Roboto Light and Roboto Medium), the copy
of Roboto Bold in Slate/Old/Tiles, 5 font faces (Regular, Bold, Italic, Bold Italic and Light), and the
distance-field font /Engine/EngineFonts/RobotoDistanceField (Roboto glyphs rendered into a texture)
Copyright: "Font data copyright Google 2011" (version 1.00000); "Copyright 2011 Google Inc. All Rights Reserved."
(Roboto Light and Roboto Medium, version 2.137)
Trademark: "Roboto is a trademark of Google."
Licence: Apache License, Version 2.0; its text is in section 6, without the LLVM exceptions that follow it
there. Epic's licence file for the fonts says so
(UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/ROBOTO_License.txt), and so do the licence
fields of the version 2.137 fonts.
Droid Sans Fallback: 1 font file in Slate/Fonts and 1 font face
Copyright: "Digitized data copyright Google Corporation (c) 2006"
Trademark: "Droid is a trademark of Google and may be registered in certain jurisdictions."
Licence: Apache License, Version 2.0, as the font's licence field says; its text is in section 6.
Droid Sans Mono: 1 font file in Slate/Fonts (version 1.00 build 107)
Copyright: "Digitized data copyright (c) 2006, Google Corporation."
Trademark: "Droid is a trademark of Google and may be registered in certain jurisdictions."
Licence: not settled (GAPS 6). Epic's record for the Droid fonts,
UE 5.9 Preview 1: Engine/Content/Slate/Fonts/DroidSans.tps, leads, through a redirect in the
release's optional Android platform files (not installed on the machine that made this file), to
the record UE 5.9 Preview 1: Engine/Source/Runtime/Core/Private/Android/AndroidOpenSourceProject.tps
("Android Open Source Project"), which names the Apache License, Version 2.0, and Epic's licence
file UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/AndroidOpenSourceProject_License.txt.
The font's own licence field holds a licence of Ascender Corporation instead.
Noto Naskh Arabic UI and Noto Sans Thai: 1 font file each in Slate/Fonts
Copyright: "Copyright 2013 Google Inc. All Rights Reserved." (Noto Naskh Arabic UI); "Copyright 2016 Google
Inc. All Rights Reserved." (Noto Sans Thai)
Trademark: "Noto is a trademark of Google Inc."
Licence: SIL Open Font License, Version 1.1, as follows. Source of the text:
UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/Noto_License.txt, named by
UE 5.9 Preview 1: Engine/Content/Slate/Fonts/Noto.tps.
------------------------------------------------------------------------------
This Font Software is licensed under the SIL Open Font License,
Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL
-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------
PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font
creation efforts of academic and linguistic communities, and to
provide a free and open framework in which fonts may be shared and
improved in partnership with others.
The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The
fonts, including any derivative works, can be bundled, embedded,
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply to
any document created using the fonts or their derivatives.
DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.
"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).
"Original Version" refers to the collection of Font Software
components as distributed by the Copyright Holder(s).
"Modified Version" refers to any derivative made by adding to,
deleting, or substituting -- in part or in whole -- any of the
components of the Original Version, by changing formats or by porting
the Font Software to a new environment.
"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.
PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Font Software, to use, study, copy, merge, embed,
modify, redistribute, and sell modified and unmodified copies of the
Font Software, subject to the following conditions:
1) Neither the Font Software nor any of its individual components, in
Original or Modified Versions, may be sold by itself.
2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.
3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the
corresponding Copyright Holder. This restriction only applies to the
primary font name as presented to the users.
4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.
5) The Font Software, modified or unmodified, in part or in whole,
must be distributed entirely under this license, and must not be
distributed under any other license. The requirement for fonts to
remain under this license does not apply to any document created using
the Font Software.
TERMINATION
This license becomes null and void if any of the above conditions are
not met.
DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.
------------------------------------------------------------------------------
The two lookup tables of the glint shading: the textures /Engine/EngineMaterials/Substrate/GLints/AGlintTex2dArray
and /Engine/EngineMaterials/Substrate/Glints2/AGlintTex2dArray2, which the engine's Substrate shading samples to
draw glints
From: "Real-Time Geometric Glint Anti-Aliasing with Normal Map Filtering" (2021). Epic's record,
UE 5.9 Preview 1: Engine/Content/EngineMaterials/Substrate/GLints/real-time_geometric_glint.tps,
says Epic converted the project's lookup table into an engine texture and adapted its shader
code; the second table has no record of its own.
Licence: MIT, in two forms. First the project's licence file as Epic ships it (without Epic's header):
UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/real-time_geometric_glint.LICENSE.txt.
Then the notice as the engine's shader file carries it (lines 9-11, comment markers dropped):
UE 5.9 Preview 1: Engine/Shaders/Private/Substrate/Glint/GlintThirdParty.ush.
MIT License
Copyright (c) 2021 ASTex-ICube
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
The MIT License
Copyright (c) 2021 Xavier Chermain (ICUBE), Simon Lucas(ICUBE), Basile Sauvage (ICUBE), Jean-Michel Dishler (ICUBE) and Carsten Dachsbacher (KIT)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
The lookup table of the sheen shading: the texture /Engine/EngineMaterials/LTC/Sheen_LTC, which the engine's
cloth and fuzz shading samples
From: Epic's record, UE 5.9 Preview 1: Engine/Source/Runtime/Renderer/Private/ltc-sheen.tps ("Sheen LTC
Coeficients"), names the ltc-sheen project (github.com/tizian/ltc-sheen) as the source of the
precomputed sheen tables in Engine/Source/Runtime/Renderer/Private/LTC.h; the texture holds the
first of them (Sheen_LTC_Volume), exported by the engine's SystemTextures.cpp.
Licence: Apache License, Version 2.0, as Epic's licence file for it says
(UE 5.9 Preview 1: Engine/Source/ThirdParty/Licenses/ltc-sheen.LICENSE, which names no copyright
holder); its text is in section 6.
The two lookup tables of SMAA (subpixel morphological anti-aliasing): the textures
/Engine/EngineMaterials/SMAAAreaTex and /Engine/EngineMaterials/SMAASearchTex, SMAA's precalculated area and
search textures
From: the SMAA project, whose shader code is listed in GAPS 7; its shader file names the two
textures (UE 5.9 Preview 1: Engine/Shaders/Private/SMAA/SMAA.ush, lines 105-108).
Copyright: Copyright (C) 2013 Jorge Jimenez, Jose I. Echevarria, Belen Masia, Fernando Navarro and Diego
Gutierrez (the copyright lines of SMAA.ush, without their e-mail addresses)
Licence: MIT, as SMAA.ush gives it, which says that the notice need not be included in binary
distributions.
==============================================================================
GAPS (not yet complete)
==============================================================================
1. Other third-party code in this game's web build. Engine/Platforms/Wasm/Docs/THIRD-PARTY.md lists only what
the web platform adds. The symbol map of this game's Shipping web build of 2026-11-12 also names code
from: Recast/Detour (navigation), LZ4, xxHash (XXH3), CityHash, nanosvg, msdfgen (Slate), Clipper2, RapidJSON,
Eigen, SQLite, jpgd/jpge, stb_image_resize2, voro++ (fracture), the Animation Compression Library with
Realtime Math (ACL, RTM), libsamplerate, and the Mutable plugin's block compression (Miro.cpp), which says it
is based on BCDec (MIT), stb_dxt (MIT), ASTCRT (BSD-3-Clause) and astc_dec (Apache-2.0). Their licences
(zlib, BSD-2-Clause, BSD-3-Clause, MIT, Boost, MPL-2.0, Apache-2.0, public domain) mostly ship with Unreal Engine
(Engine/Source/ThirdParty/Licenses: Recastv1.4.2_License.txt, LZ4_License.txt, xxHash_License.txt,
CityHash_License.txt, nanosvg_License.txt, msdfgen_License.txt, Clipper2_LICENSE.txt, RapidJSON_v1.1.0.LICENSE,
Eigen_*.license, SQLite_v3.47.1.license, Animation Compression Library_V2.1.0.LICENSE, Realtime
Math_v2.2.0.LICENSE, Libsamplerate_License.txt; the voro++ LICENSE in Engine/Source/Runtime/Experimental/
Voronoi/Private/voro++; the headers of stb_image_resize2.h and jpgd.cpp), but the versions were not matched to
the engine's records and their texts are not in this file yet; no licence file for the code Miro.cpp is based on
was found. Eigen (MPL-2.0) also asks that recipients be told where its source is.
The same symbol map also names, with their texts not in this file yet either: the ACES 2 output transform
code adapted from OpenColorIO 2.4.1 (BSD-3-Clause; Engine/Source/Runtime/Renderer/Private/PostProcess/
ACESUtils.cpp and Licenses/OpenColorIO_library_v2.4.1.license), FAAArrayQueue by Pedro Ramalhete and Andreia
Correia (BSD-3-Clause; Engine/Source/Runtime/Core/Public/Experimental/Containers/FAAArrayQueue.h), PM-k by
Robert van Engelen, Genivia Inc. (BSD-3-Clause; Engine/Source/Runtime/CoreUObject/Internal/UObject/
CoreRedirects/PM-k.h), Stan Melax's Sandbox (MIT; Engine/Source/Runtime/Engine/Private/Animation/
AnimPhysicsSolver.cpp), and the Animation Compression Library plugin by Nicholas Frechette (MIT; Licenses/
Animation Compression Library Plugin_v2.1.0.LICENSE), whose two settings assets are in the game's data files.
2. FreeType's BDF and PCF drivers are linked. Their own licences are in FreeType's src/bdf/README and
src/pcf/README, which the Launcher release of Unreal Engine 5.9 Preview 1 does not include (it has FreeType's
headers and libraries only). The fthash text in section 2 is from the same BDF code but is not those files.
3. FreeType's gzip module is linked. Whether it uses the engine's zlib or FreeType's own copy of zlib was not
checked; both are under the zlib licence (section 7).
4. The two Unreal Engine lines in section 1 follow the 2022 EULA text; the current EULA page was not available
to check them against.
5. Epic's third-party records for the web platform are marked as waiting for Epic's third-party review, so
this list may change with UE 5.9 final.
6. Droid Sans Mono (section 12): its licence is not settled. Epic's records for the Droid fonts lead to the
Android Open Source Project (Apache License 2.0), but the licence field of the font file itself holds a
licence text of Ascender Corporation (http://ascendercorp.com/eula10.html), which is not an open-source licence.
7. Third-party code compiled into the game's shaders (its shader archives of 2026-11-12), with their texts not
in this file yet: the Academy Color Encoding System (ACES) tone mapping and output transforms, whose licence
asks that binary distributions carry its notice, conditions and disclaimer in their documentation
(Licenses/ACES_v1.3_LICENSE.txt and "Academy Color Encoding System Core Transforms_v2.0.license"); Michal
Drobot's ShaderFastLibs (MIT; Engine/Shaders/Private/FastMathThirdParty.ush); the screen-space shadows of
Sony Interactive Entertainment's Bend Studio (Apache License 2.0, "Copyright 2023 Sony Interactive
Entertainment"; Engine/Shaders/Private/bend_sss_gpu.ush); and SMAA by Jorge Jimenez, Jose I. Echevarria,
Belen Masia, Fernando Navarro and Diego Gutierrez (MIT; Engine/Shaders/Private/SMAA/SMAA.ush, which says the
notice need not be included in binary distributions).
8. Three blue-noise lookup textures in the game's data files, /Engine/EngineMaterials/FastBlueNoise_scalar_128x128x64,
FastBlueNoise_scalar_128x128x8 and FastBlueNoise_vec2_128x128x64, have no Epic third-party record.
Engine/Shaders/Private/BlueNoise.ush says the scalar texture is based on "Spatiotemporal Blue Noise Masks"
(Wolfe et al. 2022) and NVIDIA's work on spatiotemporal blue noise, and the first texture's import data names
a file in a folder called SpatiotemporalBlueNoiseSDK-main. Their source and licence were not established.