Credits and open-source licences
burrow is free and open source under MIT OR Apache-2.0. It is built on other
people's work, and the notices below are required by the licences that work is under — not
supplied as a courtesy.
This page is generated at build time from the same licence manifest our CI licence check reads, so it cannot fall behind what we actually ship. Audit of record: 2026-09-10.
This page credits what your browser downloaded — the PDF engine that runs in this tab, and the components inside it. burrow's Android and iOS apps and its command-line builds carry more than this, and each of those credits its own. If you are comparing this list against the project's licence manifest, that is why it is shorter: the manifest covers every build, and this page covers yours.
Required notices
One component imposes a notice obligation that binds distribution of compiled code. It is reproduced verbatim.
libjpeg-turbo 3.2.0
IJG AND BSD-3-Clause AND Zlib — Documentation must state: this software is based in part on the work of the Independent JPEG Group. IJG LEGAL ISSUES condition 2.
libjpeg-turbo Licenses
======================
libjpeg-turbo is covered by two compatible BSD-style open source licenses:
- The IJG (Independent JPEG Group) License, which is listed in
[README.ijg](README.ijg)
This license applies to the libjpeg API library and associated programs,
including any code inherited from libjpeg and any modifications to that
code.
- The Modified (3-clause) BSD License, which is listed below
This license applies to the TurboJPEG API library and associated programs,
[libspng](https://libspng.org) (which is used by cjpeg and djpeg), and the
build/test system.
* The TurboJPEG API library wraps the libjpeg API library, so in the context
of the overall TurboJPEG API library, both the terms of the IJG License and
the terms of the Modified (3-clause) BSD License apply.
* cjpeg and djpeg use libspng, so in the context of those programs, both the
terms of the IJG License and the terms of the Modified (3-clause) BSD
License apply.
Component Licenses
==================
Some of libjpeg-turbo's modules and internal dependencies are covered by less
restrictive licenses, but in the context of libjpeg-turbo as a whole, the terms
of the less restrictive licenses are subsumed by either the IJG License or the
Modified BSD License. (In other words, the terms of the less restrictive
licenses are satisfied if the terms of the IJG and Modified BSD Licenses are
satisfied.)
- The libjpeg-turbo SIMD source code and zlib are covered by the
[zlib License](https://spdx.org/licenses/Zlib.html), which is subsumed by the
IJG License in the context of the cjpeg and djpeg programs and the libjpeg
API library.
- Some of the libspng source code is covered by the
[PNG Reference Library License v2](https://spdx.org/licenses/libpng-2.0.html),
which is subsumed by the IJG License in the context of the cjpeg and djpeg
programs and the TurboJPEG API library.
- Most of the libspng source code is covered by the
[Simplified (2-clause) BSD License](https://spdx.org/licenses/BSD-2-Clause.html),
which is subsumed by the Modified BSD License in the context of the cjpeg and
djpeg programs and the TurboJPEG API library.
Complying with the libjpeg-turbo Licenses
=========================================
This section provides a roll-up of the libjpeg-turbo licensing terms, to the
best of our understanding. This is not a license in and of itself. It is
intended solely for clarification.
1. If you are distributing a modified version of the libjpeg-turbo source,
then:
1. You cannot alter or remove any existing copyright or license notices
from the source.
**Origin**
- Clause 1 of the IJG License
- Clause 1 of the Modified BSD License
2. You must add your own copyright notice to the header of each source
file you modified, so others can tell that you modified that file. (If
there is not an existing copyright header in that file, then you can
simply add a notice stating that you modified the file.)
**Origin**
- Clause 1 of the IJG License
3. You must include the IJG README file, and you must not alter any of the
copyright or license text in that file.
**Origin**
- Clause 1 of the IJG License
2. If you are distributing only libjpeg-turbo binaries without the source, or
if you are distributing an application that statically links with
libjpeg-turbo, then:
1. Your product documentation must include a message stating:
This software is based in part on the work of the Independent JPEG
Group.
**Origin**
- Clause 2 of the IJG license
2. If your binary distribution includes or uses the TurboJPEG API or
associated programs, cjpeg, or djpeg, then your product documentation
must include the text of the Modified BSD License (see below.)
**Origin**
- Clause 2 of the Modified BSD License
3. You cannot use the name of the IJG or The libjpeg-turbo Project or the
contributors thereof in advertising, publicity, etc.
**Origin**
- IJG License
- Clause 3 of the Modified BSD License
4. The authors and distributors do not warrant libjpeg-turbo to be free of
defects, nor do we accept any liability for undesirable consequences
resulting from your use of the software.
**Origin**
- IJG License
- Modified BSD License
The Modified (3-clause) BSD License
===================================
Copyright (C) 2009-2026 D. R. Commander<br>
Copyright (C) 2018-2023 Randy <[email protected]>
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 the libjpeg-turbo Project 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 HOLDERS 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.
Every component in this download
6 components ship inside the engine this page's tools run on. Linked means its code was confirmed present in a shipped binary by symbol inspection; a component that is not linked still travels in the package we distribute.
| Component | Version | Licence | Linked |
|---|---|---|---|
| qpdf | 12.4.1 | Apache-2.0 | yes |
| sphlib sha2 (in libqpdf) | 3.0 | MIT | yes |
| rijndael (in libqpdf) | bundled with qpdf 12.4.1 | CC0-1.0 | yes |
| zlib | 1.3.2 | Zlib | yes |
| libjpeg-turbo | 3.2.0 | IJG AND BSD-3-Clause AND Zlib | yes |
| Emscripten runtime (musl libc, libc++, compiler-rt, JS glue) | 6.0.9 | MIT AND Apache-2.0 WITH LLVM-exception | yes |
Full licence texts
qpdf 12.4.1
Apache-2.0
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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APPENDIX: How to apply the Apache License to your work.
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sphlib sha2 (in libqpdf) 3.0
MIT
qpdf is copyright (c) 2005-2021 Jay Berkenbilt, 2022-2026 Jay Berkenbilt and Manfred Holger 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. Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic License. At your option, you may continue to consider qpdf to be licensed under those terms. Please see the manual for additional information. The qpdf distribution includes a copy of [qtest](https://qtest.sourceforge.io), which is released under the terms of the [version 2.0 of the Artistic license](https://opensource.org/licenses/Artistic-2.0), which can be found at https://opensource.org/licenses/Artistic-2.0. The Rijndael encryption implementation used as the basis for AES encryption and decryption support comes from Philip J. Erdelsky's public domain implementation. The files `libqpdf/rijndael.cc` and `libqpdf/qpdf/rijndael.h` remain in the public domain. They were obtained from * http://www.efgh.com/software/rijndael.htm * http://www.efgh.com/software/rijndael.txt The embedded sha2 code comes from sphlib 3.0 * http://www.saphir2.com/sphlib/ That code has the following license: ``` Copyright (c) 2007-2011 Projet RNRT SAPHIR 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. ```
rijndael (in libqpdf) bundled with qpdf 12.4.1
CC0-1.0
qpdf is copyright (c) 2005-2021 Jay Berkenbilt, 2022-2026 Jay Berkenbilt and Manfred Holger 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. Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic License. At your option, you may continue to consider qpdf to be licensed under those terms. Please see the manual for additional information. The qpdf distribution includes a copy of [qtest](https://qtest.sourceforge.io), which is released under the terms of the [version 2.0 of the Artistic license](https://opensource.org/licenses/Artistic-2.0), which can be found at https://opensource.org/licenses/Artistic-2.0. The Rijndael encryption implementation used as the basis for AES encryption and decryption support comes from Philip J. Erdelsky's public domain implementation. The files `libqpdf/rijndael.cc` and `libqpdf/qpdf/rijndael.h` remain in the public domain. They were obtained from * http://www.efgh.com/software/rijndael.htm * http://www.efgh.com/software/rijndael.txt The embedded sha2 code comes from sphlib 3.0 * http://www.saphir2.com/sphlib/ That code has the following license: ``` Copyright (c) 2007-2011 Projet RNRT SAPHIR 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. ```
zlib 1.3.2
Zlib
Copyright notice:
(C) 1995-2026 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
[email protected] [email protected]
libjpeg-turbo 3.2.0
IJG AND BSD-3-Clause AND Zlib
libjpeg-turbo Licenses
======================
libjpeg-turbo is covered by two compatible BSD-style open source licenses:
- The IJG (Independent JPEG Group) License, which is listed in
[README.ijg](README.ijg)
This license applies to the libjpeg API library and associated programs,
including any code inherited from libjpeg and any modifications to that
code.
- The Modified (3-clause) BSD License, which is listed below
This license applies to the TurboJPEG API library and associated programs,
[libspng](https://libspng.org) (which is used by cjpeg and djpeg), and the
build/test system.
* The TurboJPEG API library wraps the libjpeg API library, so in the context
of the overall TurboJPEG API library, both the terms of the IJG License and
the terms of the Modified (3-clause) BSD License apply.
* cjpeg and djpeg use libspng, so in the context of those programs, both the
terms of the IJG License and the terms of the Modified (3-clause) BSD
License apply.
Component Licenses
==================
Some of libjpeg-turbo's modules and internal dependencies are covered by less
restrictive licenses, but in the context of libjpeg-turbo as a whole, the terms
of the less restrictive licenses are subsumed by either the IJG License or the
Modified BSD License. (In other words, the terms of the less restrictive
licenses are satisfied if the terms of the IJG and Modified BSD Licenses are
satisfied.)
- The libjpeg-turbo SIMD source code and zlib are covered by the
[zlib License](https://spdx.org/licenses/Zlib.html), which is subsumed by the
IJG License in the context of the cjpeg and djpeg programs and the libjpeg
API library.
- Some of the libspng source code is covered by the
[PNG Reference Library License v2](https://spdx.org/licenses/libpng-2.0.html),
which is subsumed by the IJG License in the context of the cjpeg and djpeg
programs and the TurboJPEG API library.
- Most of the libspng source code is covered by the
[Simplified (2-clause) BSD License](https://spdx.org/licenses/BSD-2-Clause.html),
which is subsumed by the Modified BSD License in the context of the cjpeg and
djpeg programs and the TurboJPEG API library.
Complying with the libjpeg-turbo Licenses
=========================================
This section provides a roll-up of the libjpeg-turbo licensing terms, to the
best of our understanding. This is not a license in and of itself. It is
intended solely for clarification.
1. If you are distributing a modified version of the libjpeg-turbo source,
then:
1. You cannot alter or remove any existing copyright or license notices
from the source.
**Origin**
- Clause 1 of the IJG License
- Clause 1 of the Modified BSD License
2. You must add your own copyright notice to the header of each source
file you modified, so others can tell that you modified that file. (If
there is not an existing copyright header in that file, then you can
simply add a notice stating that you modified the file.)
**Origin**
- Clause 1 of the IJG License
3. You must include the IJG README file, and you must not alter any of the
copyright or license text in that file.
**Origin**
- Clause 1 of the IJG License
2. If you are distributing only libjpeg-turbo binaries without the source, or
if you are distributing an application that statically links with
libjpeg-turbo, then:
1. Your product documentation must include a message stating:
This software is based in part on the work of the Independent JPEG
Group.
**Origin**
- Clause 2 of the IJG license
2. If your binary distribution includes or uses the TurboJPEG API or
associated programs, cjpeg, or djpeg, then your product documentation
must include the text of the Modified BSD License (see below.)
**Origin**
- Clause 2 of the Modified BSD License
3. You cannot use the name of the IJG or The libjpeg-turbo Project or the
contributors thereof in advertising, publicity, etc.
**Origin**
- IJG License
- Clause 3 of the Modified BSD License
4. The authors and distributors do not warrant libjpeg-turbo to be free of
defects, nor do we accept any liability for undesirable consequences
resulting from your use of the software.
**Origin**
- IJG License
- Modified BSD License
The Modified (3-clause) BSD License
===================================
Copyright (C) 2009-2026 D. R. Commander<br>
Copyright (C) 2018-2023 Randy <[email protected]>
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 the libjpeg-turbo Project 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 HOLDERS 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.
Emscripten runtime (musl libc, libc++, compiler-rt, JS glue) 6.0.9
MIT AND Apache-2.0 WITH LLVM-exception
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
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copies of the Software, and to permit persons to whom the Software is
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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
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"Software"), to deal with the Software without restriction, including
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permit persons to whom the Software is furnished to do so, subject to
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Redistributions of source code must retain the above copyright
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Redistributions in binary form must reproduce the above
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Neither the names of Mozilla,
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==============================================================================
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
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The above copyright notice and this permission notice shall be included in
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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
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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/).
burrow itself
burrow is licensed under either of Apache-2.0 or MIT, at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in
burrow shall be dual licensed as above, without any additional terms or conditions.
Source: github.com/TensorGreed/burrow. The
machine-readable manifest behind this page is engines/licenses.toml, and the full
repository notices are in THIRD_PARTY_NOTICES.md.