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class="reference internal" href="#">History and License</a><ul> <li><a class="reference internal" href="#history-of-the-software">History of the software</a></li> <li><a class="reference internal" href="#terms-and-conditions-for-accessing-or-otherwise-using-python">Terms and conditions for accessing or otherwise using Python</a><ul> <li><a class="reference internal" href="#psf-license-agreement-for-python-release">PSF LICENSE AGREEMENT FOR PYTHON 3.13.0</a></li> <li><a class="reference internal" href="#beopen-com-license-agreement-for-python-2-0">BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0</a></li> <li><a class="reference internal" href="#cnri-license-agreement-for-python-1-6-1">CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1</a></li> <li><a class="reference internal" href="#cwi-license-agreement-for-python-0-9-0-through-1-2">CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2</a></li> <li><a class="reference internal" href="#zero-clause-bsd-license-for-code-in-the-python-release-documentation">ZERO-CLAUSE BSD LICENSE FOR CODE IN THE PYTHON 3.13.0 DOCUMENTATION</a></li> </ul> </li> <li><a class="reference internal" href="#licenses-and-acknowledgements-for-incorporated-software">Licenses and Acknowledgements for Incorporated Software</a><ul> <li><a class="reference internal" href="#mersenne-twister">Mersenne Twister</a></li> <li><a class="reference internal" href="#sockets">Sockets</a></li> <li><a class="reference internal" href="#asynchronous-socket-services">Asynchronous socket services</a></li> <li><a class="reference internal" href="#cookie-management">Cookie management</a></li> <li><a class="reference internal" href="#execution-tracing">Execution tracing</a></li> <li><a class="reference internal" href="#uuencode-and-uudecode-functions">UUencode and UUdecode functions</a></li> <li><a class="reference internal" href="#xml-remote-procedure-calls">XML Remote Procedure Calls</a></li> <li><a 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class="bodywrapper"> <div class="body" role="main"> <section id="history-and-license"> <span id="id1"></span><h1>History and License<a class="headerlink" href="#history-and-license" title="Link to this heading">¶</a></h1> <section id="history-of-the-software"> <h2>History of the software<a class="headerlink" href="#history-of-the-software" title="Link to this heading">¶</a></h2> <p>Python was created in the early 1990s by Guido van Rossum at Stichting Mathematisch Centrum (CWI, see <a class="reference external" href="https://www.cwi.nl/">https://www.cwi.nl/</a>) in the Netherlands as a successor of a language called ABC. Guido remains Python’s principal author, although it includes many contributions from others.</p> <p>In 1995, Guido continued his work on Python at the Corporation for National Research Initiatives (CNRI, see <a class="reference external" href="https://www.cnri.reston.va.us/">https://www.cnri.reston.va.us/</a>) in Reston, Virginia where he released several versions of the software.</p> <p>In May 2000, Guido and the Python core development team moved to BeOpen.com to form the BeOpen PythonLabs team. In October of the same year, the PythonLabs team moved to Digital Creations (now Zope Corporation; see <a class="reference external" href="https://www.zope.org/">https://www.zope.org/</a>). In 2001, the Python Software Foundation (PSF, see <a class="reference external" href="https://www.python.org/psf/">https://www.python.org/psf/</a>) was formed, a non-profit organization created specifically to own Python-related Intellectual Property. Zope Corporation is a sponsoring member of the PSF.</p> <p>All Python releases are Open Source (see <a class="reference external" href="https://opensource.org/">https://opensource.org/</a> for the Open Source Definition). Historically, most, but not all, Python releases have also been GPL-compatible; the table below summarizes the various releases.</p> <table class="docutils align-default"> <thead> <tr class="row-odd"><th class="head"><p>Release</p></th> <th class="head"><p>Derived from</p></th> <th class="head"><p>Year</p></th> <th class="head"><p>Owner</p></th> <th class="head"><p>GPL compatible?</p></th> </tr> </thead> <tbody> <tr class="row-even"><td><p>0.9.0 thru 1.2</p></td> <td><p>n/a</p></td> <td><p>1991-1995</p></td> <td><p>CWI</p></td> <td><p>yes</p></td> </tr> <tr class="row-odd"><td><p>1.3 thru 1.5.2</p></td> <td><p>1.2</p></td> <td><p>1995-1999</p></td> <td><p>CNRI</p></td> <td><p>yes</p></td> </tr> <tr class="row-even"><td><p>1.6</p></td> <td><p>1.5.2</p></td> <td><p>2000</p></td> <td><p>CNRI</p></td> <td><p>no</p></td> </tr> <tr class="row-odd"><td><p>2.0</p></td> <td><p>1.6</p></td> <td><p>2000</p></td> <td><p>BeOpen.com</p></td> <td><p>no</p></td> </tr> <tr class="row-even"><td><p>1.6.1</p></td> <td><p>1.6</p></td> <td><p>2001</p></td> <td><p>CNRI</p></td> <td><p>no</p></td> </tr> <tr class="row-odd"><td><p>2.1</p></td> <td><p>2.0+1.6.1</p></td> <td><p>2001</p></td> <td><p>PSF</p></td> <td><p>no</p></td> </tr> <tr class="row-even"><td><p>2.0.1</p></td> <td><p>2.0+1.6.1</p></td> <td><p>2001</p></td> <td><p>PSF</p></td> <td><p>yes</p></td> </tr> <tr class="row-odd"><td><p>2.1.1</p></td> <td><p>2.1+2.0.1</p></td> <td><p>2001</p></td> <td><p>PSF</p></td> <td><p>yes</p></td> </tr> <tr class="row-even"><td><p>2.1.2</p></td> <td><p>2.1.1</p></td> <td><p>2002</p></td> <td><p>PSF</p></td> <td><p>yes</p></td> </tr> <tr class="row-odd"><td><p>2.1.3</p></td> <td><p>2.1.2</p></td> <td><p>2002</p></td> <td><p>PSF</p></td> <td><p>yes</p></td> </tr> <tr class="row-even"><td><p>2.2 and above</p></td> <td><p>2.1.1</p></td> <td><p>2001-now</p></td> <td><p>PSF</p></td> <td><p>yes</p></td> </tr> </tbody> </table> <div class="admonition note"> <p class="admonition-title">Note</p> <p>GPL-compatible doesn’t mean that we’re distributing Python under the GPL. All Python licenses, unlike the GPL, let you distribute a modified version without making your changes open source. The GPL-compatible licenses make it possible to combine Python with other software that is released under the GPL; the others don’t.</p> </div> <p>Thanks to the many outside volunteers who have worked under Guido’s direction to make these releases possible.</p> </section> <section id="terms-and-conditions-for-accessing-or-otherwise-using-python"> <h2>Terms and conditions for accessing or otherwise using Python<a class="headerlink" href="#terms-and-conditions-for-accessing-or-otherwise-using-python" title="Link to this heading">¶</a></h2> <p>Python software and documentation are licensed under the <a class="reference internal" href="#psf-license"><span class="std std-ref">PSF License Agreement</span></a>.</p> <p>Starting with Python 3.8.6, examples, recipes, and other code in the documentation are dual licensed under the PSF License Agreement and the <a class="reference internal" href="#bsd0"><span class="std std-ref">Zero-Clause BSD license</span></a>.</p> <p>Some software incorporated into Python is under different licenses. The licenses are listed with code falling under that license. See <a class="reference internal" href="#otherlicenses"><span class="std std-ref">Licenses and Acknowledgements for Incorporated Software</span></a> for an incomplete list of these licenses.</p> <section id="psf-license-agreement-for-python-release"> <span id="psf-license"></span><h3>PSF LICENSE AGREEMENT FOR PYTHON 3.13.0<a class="headerlink" href="#psf-license-agreement-for-python-release" title="Link to this heading">¶</a></h3> <pre class="literal-block">1. This LICENSE AGREEMENT is between the Python Software Foundation ("PSF"), and the Individual or Organization ("Licensee") accessing and otherwise using Python 3.13.0 software in source or binary form and its associated documentation. 2. Subject to the terms and conditions of this License Agreement, PSF hereby grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce, analyze, test, perform and/or display publicly, prepare derivative works, distribute, and otherwise use Python 3.13.0 alone or in any derivative version, provided, however, that PSF's License Agreement and PSF's notice of copyright, i.e., "Copyright © 2001-2024 Python Software Foundation; All Rights Reserved" are retained in Python 3.13.0 alone or in any derivative version prepared by Licensee. 3. In the event Licensee prepares a derivative work that is based on or incorporates Python 3.13.0 or any part thereof, and wants to make the derivative work available to others as provided herein, then Licensee hereby agrees to include in any such work a brief summary of the changes made to Python 3.13.0. 4. PSF is making Python 3.13.0 available to Licensee on an "AS IS" basis. PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON 3.13.0 WILL NOT INFRINGE ANY THIRD PARTY RIGHTS. 5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON 3.13.0 FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 3.13.0, OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. 6. This License Agreement will automatically terminate upon a material breach of its terms and conditions. 7. Nothing in this License Agreement shall be deemed to create any relationship of agency, partnership, or joint venture between PSF and Licensee. This License Agreement does not grant permission to use PSF trademarks or trade name in a trademark sense to endorse or promote products or services of Licensee, or any third party. 8. By copying, installing or otherwise using Python 3.13.0, Licensee agrees to be bound by the terms and conditions of this License Agreement.</pre> </section> <section id="beopen-com-license-agreement-for-python-2-0"> <h3>BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0<a class="headerlink" href="#beopen-com-license-agreement-for-python-2-0" title="Link to this heading">¶</a></h3> <p>BEOPEN PYTHON OPEN SOURCE LICENSE AGREEMENT VERSION 1</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>1. This LICENSE AGREEMENT is between BeOpen.com ("BeOpen"), having an office at 160 Saratoga Avenue, Santa Clara, CA 95051, and the Individual or Organization ("Licensee") accessing and otherwise using this software in source or binary form and its associated documentation ("the Software"). 2. Subject to the terms and conditions of this BeOpen Python License Agreement, BeOpen hereby grants Licensee a non-exclusive, royalty-free, world-wide license to reproduce, analyze, test, perform and/or display publicly, prepare derivative works, distribute, and otherwise use the Software alone or in any derivative version, provided, however, that the BeOpen Python License is retained in the Software, alone or in any derivative version prepared by Licensee. 3. BeOpen is making the Software available to Licensee on an "AS IS" basis. BEOPEN MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, BEOPEN MAKES NO AND DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF THE SOFTWARE WILL NOT INFRINGE ANY THIRD PARTY RIGHTS. 4. BEOPEN SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF THE SOFTWARE FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE SOFTWARE, OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. 5. This License Agreement will automatically terminate upon a material breach of its terms and conditions. 6. This License Agreement shall be governed by and interpreted in all respects by the law of the State of California, excluding conflict of law provisions. Nothing in this License Agreement shall be deemed to create any relationship of agency, partnership, or joint venture between BeOpen and Licensee. This License Agreement does not grant permission to use BeOpen trademarks or trade names in a trademark sense to endorse or promote products or services of Licensee, or any third party. As an exception, the "BeOpen Python" logos available at http://www.pythonlabs.com/logos.html may be used according to the permissions granted on that web page. 7. By copying, installing or otherwise using the software, Licensee agrees to be bound by the terms and conditions of this License Agreement. </pre></div> </div> </section> <section id="cnri-license-agreement-for-python-1-6-1"> <h3>CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1<a class="headerlink" href="#cnri-license-agreement-for-python-1-6-1" title="Link to this heading">¶</a></h3> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>1. This LICENSE AGREEMENT is between the Corporation for National Research Initiatives, having an office at 1895 Preston White Drive, Reston, VA 20191 ("CNRI"), and the Individual or Organization ("Licensee") accessing and otherwise using Python 1.6.1 software in source or binary form and its associated documentation. 2. Subject to the terms and conditions of this License Agreement, CNRI hereby grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce, analyze, test, perform and/or display publicly, prepare derivative works, distribute, and otherwise use Python 1.6.1 alone or in any derivative version, provided, however, that CNRI's License Agreement and CNRI's notice of copyright, i.e., "Copyright © 1995-2001 Corporation for National Research Initiatives; All Rights Reserved" are retained in Python 1.6.1 alone or in any derivative version prepared by Licensee. Alternately, in lieu of CNRI's License Agreement, Licensee may substitute the following text (omitting the quotes): "Python 1.6.1 is made available subject to the terms and conditions in CNRI's License Agreement. This Agreement together with Python 1.6.1 may be located on the internet using the following unique, persistent identifier (known as a handle): 1895.22/1013. This Agreement may also be obtained from a proxy server on the internet using the following URL: http://hdl.handle.net/1895.22/1013." 3. In the event Licensee prepares a derivative work that is based on or incorporates Python 1.6.1 or any part thereof, and wants to make the derivative work available to others as provided herein, then Licensee hereby agrees to include in any such work a brief summary of the changes made to Python 1.6.1. 4. CNRI is making Python 1.6.1 available to Licensee on an "AS IS" basis. CNRI MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, CNRI MAKES NO AND DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON 1.6.1 WILL NOT INFRINGE ANY THIRD PARTY RIGHTS. 5. CNRI SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON 1.6.1 FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 1.6.1, OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. 6. This License Agreement will automatically terminate upon a material breach of its terms and conditions. 7. This License Agreement shall be governed by the federal intellectual property law of the United States, including without limitation the federal copyright law, and, to the extent such U.S. federal law does not apply, by the law of the Commonwealth of Virginia, excluding Virginia's conflict of law provisions. Notwithstanding the foregoing, with regard to derivative works based on Python 1.6.1 that incorporate non-separable material that was previously distributed under the GNU General Public License (GPL), the law of the Commonwealth of Virginia shall govern this License Agreement only as to issues arising under or with respect to Paragraphs 4, 5, and 7 of this License Agreement. Nothing in this License Agreement shall be deemed to create any relationship of agency, partnership, or joint venture between CNRI and Licensee. This License Agreement does not grant permission to use CNRI trademarks or trade name in a trademark sense to endorse or promote products or services of Licensee, or any third party. 8. By clicking on the "ACCEPT" button where indicated, or by copying, installing or otherwise using Python 1.6.1, Licensee agrees to be bound by the terms and conditions of this License Agreement. </pre></div> </div> </section> <section id="cwi-license-agreement-for-python-0-9-0-through-1-2"> <h3>CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2<a class="headerlink" href="#cwi-license-agreement-for-python-0-9-0-through-1-2" title="Link to this heading">¶</a></h3> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright © 1991 - 1995, Stichting Mathematisch Centrum Amsterdam, The Netherlands. All rights reserved. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Stichting Mathematisch Centrum or CWI not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. </pre></div> </div> </section> <section id="zero-clause-bsd-license-for-code-in-the-python-release-documentation"> <span id="bsd0"></span><h3>ZERO-CLAUSE BSD LICENSE FOR CODE IN THE PYTHON 3.13.0 DOCUMENTATION<a class="headerlink" href="#zero-clause-bsd-license-for-code-in-the-python-release-documentation" title="Link to this heading">¶</a></h3> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. </pre></div> </div> </section> </section> <section id="licenses-and-acknowledgements-for-incorporated-software"> <span id="otherlicenses"></span><h2>Licenses and Acknowledgements for Incorporated Software<a class="headerlink" href="#licenses-and-acknowledgements-for-incorporated-software" title="Link to this heading">¶</a></h2> <p>This section is an incomplete, but growing list of licenses and acknowledgements for third-party software incorporated in the Python distribution.</p> <section id="mersenne-twister"> <h3>Mersenne Twister<a class="headerlink" href="#mersenne-twister" title="Link to this heading">¶</a></h3> <p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">_random</span></code> C extension underlying the <a class="reference internal" href="library/random.html#module-random" title="random: Generate pseudo-random numbers with various common distributions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">random</span></code></a> module includes code based on a download from <a class="reference external" href="http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html">http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html</a>. The following are the verbatim comments from the original code:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>A C-program for MT19937, with initialization improved 2002/1/26. Coded by Takuji Nishimura and Makoto Matsumoto. Before using, initialize the state by using init_genrand(seed) or init_by_array(init_key, key_length). Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, All rights reserved. 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. The names of its contributors may not 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. Any feedback is very welcome. http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space) </pre></div> </div> </section> <section id="sockets"> <h3>Sockets<a class="headerlink" href="#sockets" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/socket.html#module-socket" title="socket: Low-level networking interface."><code class="xref py py-mod docutils literal notranslate"><span class="pre">socket</span></code></a> module uses the functions, <code class="xref c c-func docutils literal notranslate"><span class="pre">getaddrinfo()</span></code>, and <code class="xref c c-func docutils literal notranslate"><span class="pre">getnameinfo()</span></code>, which are coded in separate source files from the WIDE Project, <a class="reference external" href="https://www.wide.ad.jp/">https://www.wide.ad.jp/</a>.</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. All rights reserved. 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 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 PROJECT 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 PROJECT 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. </pre></div> </div> </section> <section id="asynchronous-socket-services"> <h3>Asynchronous socket services<a class="headerlink" href="#asynchronous-socket-services" title="Link to this heading">¶</a></h3> <p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">test.support.asynchat</span></code> and <code class="xref py py-mod docutils literal notranslate"><span class="pre">test.support.asyncore</span></code> modules contain the following notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright 1996 by Sam Rushing All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Sam Rushing not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. </pre></div> </div> </section> <section id="cookie-management"> <h3>Cookie management<a class="headerlink" href="#cookie-management" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/http.cookies.html#module-http.cookies" title="http.cookies: Support for HTTP state management (cookies)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">http.cookies</span></code></a> module contains the following notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright 2000 by Timothy O'Malley <timo@alum.mit.edu> All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Timothy O'Malley not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. Timothy O'Malley DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL Timothy O'Malley BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. </pre></div> </div> </section> <section id="execution-tracing"> <h3>Execution tracing<a class="headerlink" href="#execution-tracing" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/trace.html#module-trace" title="trace: Trace or track Python statement execution."><code class="xref py py-mod docutils literal notranslate"><span class="pre">trace</span></code></a> module contains the following notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>portions copyright 2001, Autonomous Zones Industries, Inc., all rights... err... reserved and offered to the public under the terms of the Python 2.2 license. Author: Zooko O'Whielacronx http://zooko.com/ mailto:zooko@zooko.com Copyright 2000, Mojam Media, Inc., all rights reserved. Author: Skip Montanaro Copyright 1999, Bioreason, Inc., all rights reserved. Author: Andrew Dalke Copyright 1995-1997, Automatrix, Inc., all rights reserved. Author: Skip Montanaro Copyright 1991-1995, Stichting Mathematisch Centrum, all rights reserved. Permission to use, copy, modify, and distribute this Python software and its associated documentation for any purpose without fee is hereby granted, provided that the above copyright notice appears in all copies, and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of neither Automatrix, Bioreason or Mojam Media be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. </pre></div> </div> </section> <section id="uuencode-and-uudecode-functions"> <h3>UUencode and UUdecode functions<a class="headerlink" href="#uuencode-and-uudecode-functions" title="Link to this heading">¶</a></h3> <p>The <code class="docutils literal notranslate"><span class="pre">uu</span></code> codec contains the following notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright 1994 by Lance Ellinghouse Cathedral City, California Republic, United States of America. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Lance Ellinghouse not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. Modified by Jack Jansen, CWI, July 1995: - Use binascii module to do the actual line-by-line conversion between ascii and binary. This results in a 1000-fold speedup. The C version is still 5 times faster, though. - Arguments more compliant with Python standard </pre></div> </div> </section> <section id="xml-remote-procedure-calls"> <h3>XML Remote Procedure Calls<a class="headerlink" href="#xml-remote-procedure-calls" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/xmlrpc.client.html#module-xmlrpc.client" title="xmlrpc.client: XML-RPC client access."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xmlrpc.client</span></code></a> module contains the following notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span> The XML-RPC client interface is Copyright (c) 1999-2002 by Secret Labs AB Copyright (c) 1999-2002 by Fredrik Lundh By obtaining, using, and/or copying this software and/or its associated documentation, you agree that you have read, understood, and will comply with the following terms and conditions: Permission to use, copy, modify, and distribute this software and its associated documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appears in all copies, and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Secret Labs AB or the author not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT- ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. </pre></div> </div> </section> <section id="test-epoll"> <h3>test_epoll<a class="headerlink" href="#test-epoll" title="Link to this heading">¶</a></h3> <p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">test.test_epoll</span></code> module contains the following notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2001-2006 Twisted Matrix Laboratories. 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. </pre></div> </div> </section> <section id="select-kqueue"> <h3>Select kqueue<a class="headerlink" href="#select-kqueue" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/select.html#module-select" title="select: Wait for I/O completion on multiple streams."><code class="xref py py-mod docutils literal notranslate"><span class="pre">select</span></code></a> module contains the following notice for the kqueue interface:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2000 Doug White, 2006 James Knight, 2007 Christian Heimes All rights reserved. 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. THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. </pre></div> </div> </section> <section id="siphash24"> <h3>SipHash24<a class="headerlink" href="#siphash24" title="Link to this heading">¶</a></h3> <p>The file <code class="file docutils literal notranslate"><span class="pre">Python/pyhash.c</span></code> contains Marek Majkowski’ implementation of Dan Bernstein’s SipHash24 algorithm. It contains the following note:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span><MIT License> Copyright (c) 2013 Marek Majkowski <marek@popcount.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 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. </MIT License> Original location: https://github.com/majek/csiphash/ Solution inspired by code from: Samuel Neves (supercop/crypto_auth/siphash24/little) djb (supercop/crypto_auth/siphash24/little2) Jean-Philippe Aumasson (https://131002.net/siphash/siphash24.c) </pre></div> </div> </section> <section id="strtod-and-dtoa"> <h3>strtod and dtoa<a class="headerlink" href="#strtod-and-dtoa" title="Link to this heading">¶</a></h3> <p>The file <code class="file docutils literal notranslate"><span class="pre">Python/dtoa.c</span></code>, which supplies C functions dtoa and strtod for conversion of C doubles to and from strings, is derived from the file of the same name by David M. Gay, currently available from <a class="reference external" href="https://web.archive.org/web/20220517033456/http://www.netlib.org/fp/dtoa.c">https://web.archive.org/web/20220517033456/http://www.netlib.org/fp/dtoa.c</a>. The original file, as retrieved on March 16, 2009, contains the following copyright and licensing notice:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>/**************************************************************** * * The author of this software is David M. Gay. * * Copyright (c) 1991, 2000, 2001 by Lucent Technologies. * * Permission to use, copy, modify, and distribute this software for any * purpose without fee is hereby granted, provided that this entire notice * is included in all copies of any software which is or includes a copy * or modification of this software and in all copies of the supporting * documentation for such software. * * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED * WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. * ***************************************************************/ </pre></div> </div> </section> <section id="openssl"> <h3>OpenSSL<a class="headerlink" href="#openssl" title="Link to this heading">¶</a></h3> <p>The modules <a class="reference internal" href="library/hashlib.html#module-hashlib" title="hashlib: Secure hash and message digest algorithms."><code class="xref py py-mod docutils literal notranslate"><span class="pre">hashlib</span></code></a>, <a class="reference internal" href="library/posix.html#module-posix" title="posix: The most common POSIX system calls (normally used via module os). (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">posix</span></code></a> and <a class="reference internal" href="library/ssl.html#module-ssl" title="ssl: TLS/SSL wrapper for socket objects"><code class="xref py py-mod docutils literal notranslate"><span class="pre">ssl</span></code></a> use the OpenSSL library for added performance if made available by the operating system. Additionally, the Windows and macOS installers for Python may include a copy of the OpenSSL libraries, so we include a copy of the OpenSSL license here. For the OpenSSL 3.0 release, and later releases derived from that, the Apache License v2 applies:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span> Apache License Version 2.0, January 2004 https://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." 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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. 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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 </pre></div> </div> </section> <section id="expat"> <h3>expat<a class="headerlink" href="#expat" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/pyexpat.html#module-xml.parsers.expat" title="xml.parsers.expat: An interface to the Expat non-validating XML parser."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pyexpat</span></code></a> extension is built using an included copy of the expat sources unless the build is configured <code class="docutils literal notranslate"><span class="pre">--with-system-expat</span></code>:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd and Clark Cooper 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. </pre></div> </div> </section> <section id="libffi"> <h3>libffi<a class="headerlink" href="#libffi" title="Link to this heading">¶</a></h3> <p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">_ctypes</span></code> C extension underlying the <a class="reference internal" href="library/ctypes.html#module-ctypes" title="ctypes: A foreign function library for Python."><code class="xref py py-mod docutils literal notranslate"><span class="pre">ctypes</span></code></a> module is built using an included copy of the libffi sources unless the build is configured <code class="docutils literal notranslate"><span class="pre">--with-system-libffi</span></code>:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 1996-2008 Red Hat, Inc and others. 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. </pre></div> </div> </section> <section id="zlib"> <h3>zlib<a class="headerlink" href="#zlib" title="Link to this heading">¶</a></h3> <p>The <a class="reference internal" href="library/zlib.html#module-zlib" title="zlib: Low-level interface to compression and decompression routines compatible with gzip."><code class="xref py py-mod docutils literal notranslate"><span class="pre">zlib</span></code></a> extension is built using an included copy of the zlib sources if the zlib version found on the system is too old to be used for the build:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (C) 1995-2011 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 </pre></div> </div> </section> <section id="cfuhash"> <h3>cfuhash<a class="headerlink" href="#cfuhash" title="Link to this heading">¶</a></h3> <p>The implementation of the hash table used by the <a class="reference internal" href="library/tracemalloc.html#module-tracemalloc" title="tracemalloc: Trace memory allocations."><code class="xref py py-mod docutils literal notranslate"><span class="pre">tracemalloc</span></code></a> is based on the cfuhash project:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2005 Don Owens All rights reserved. This code is released under the BSD license: 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 author 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 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. </pre></div> </div> </section> <section id="libmpdec"> <h3>libmpdec<a class="headerlink" href="#libmpdec" title="Link to this heading">¶</a></h3> <p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">_decimal</span></code> C extension underlying the <a class="reference internal" href="library/decimal.html#module-decimal" title="decimal: Implementation of the General Decimal Arithmetic Specification."><code class="xref py py-mod docutils literal notranslate"><span class="pre">decimal</span></code></a> module is built using an included copy of the libmpdec library unless the build is configured <code class="docutils literal notranslate"><span class="pre">--with-system-libmpdec</span></code>:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2008-2020 Stefan Krah. All rights reserved. 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. THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. </pre></div> </div> </section> <section id="w3c-c14n-test-suite"> <h3>W3C C14N test suite<a class="headerlink" href="#w3c-c14n-test-suite" title="Link to this heading">¶</a></h3> <p>The C14N 2.0 test suite in the <a class="reference internal" href="library/test.html#module-test" title="test: Regression tests package containing the testing suite for Python."><code class="xref py py-mod docutils literal notranslate"><span class="pre">test</span></code></a> package (<code class="docutils literal notranslate"><span class="pre">Lib/test/xmltestdata/c14n-20/</span></code>) was retrieved from the W3C website at <a class="reference external" href="https://www.w3.org/TR/xml-c14n2-testcases/">https://www.w3.org/TR/xml-c14n2-testcases/</a> and is distributed under the 3-clause BSD license:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2013 W3C(R) (MIT, ERCIM, Keio, Beihang), All Rights Reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of works must retain the original copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the original 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 W3C nor the names of its contributors may be used to endorse or promote products derived from this work 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. </pre></div> </div> </section> <section id="mimalloc"> <span id="mimalloc-license"></span><h3>mimalloc<a class="headerlink" href="#mimalloc" title="Link to this heading">¶</a></h3> <p>MIT License:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2018-2021 Microsoft Corporation, Daan Leijen 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. </pre></div> </div> </section> <section id="asyncio"> <h3>asyncio<a class="headerlink" href="#asyncio" title="Link to this heading">¶</a></h3> <p>Parts of the <a class="reference internal" href="library/asyncio.html#module-asyncio" title="asyncio: Asynchronous I/O."><code class="xref py py-mod docutils literal notranslate"><span class="pre">asyncio</span></code></a> module are incorporated from <a class="reference external" href="https://github.com/MagicStack/uvloop/tree/v0.16.0">uvloop 0.16</a>, which is distributed under the MIT license:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2015-2021 MagicStack Inc. http://magic.io 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. </pre></div> </div> </section> <section id="global-unbounded-sequences-gus"> <h3>Global Unbounded Sequences (GUS)<a class="headerlink" href="#global-unbounded-sequences-gus" title="Link to this heading">¶</a></h3> <p>The file <code class="file docutils literal notranslate"><span class="pre">Python/qsbr.c</span></code> is adapted from FreeBSD’s “Global Unbounded Sequences” safe memory reclamation scheme in <a class="reference external" href="https://github.com/freebsd/freebsd-src/blob/main/sys/kern/subr_smr.c">subr_smr.c</a>. The file is distributed under the 2-Clause BSD License:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Copyright (c) 2019,2020 Jeffrey Roberson <jeff@FreeBSD.org> 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 unmodified, 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. THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. </pre></div> </div> </section> </section> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="Main"> <div class="sphinxsidebarwrapper"> <div> <h3><a href="contents.html">Table of Contents</a></h3> <ul> <li><a class="reference internal" href="#">History and License</a><ul> <li><a class="reference internal" href="#history-of-the-software">History of the software</a></li> <li><a class="reference internal" href="#terms-and-conditions-for-accessing-or-otherwise-using-python">Terms and conditions for accessing or otherwise using Python</a><ul> <li><a class="reference internal" href="#psf-license-agreement-for-python-release">PSF LICENSE AGREEMENT FOR PYTHON 3.13.0</a></li> <li><a class="reference internal" href="#beopen-com-license-agreement-for-python-2-0">BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0</a></li> <li><a class="reference internal" href="#cnri-license-agreement-for-python-1-6-1">CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1</a></li> <li><a class="reference internal" href="#cwi-license-agreement-for-python-0-9-0-through-1-2">CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2</a></li> <li><a class="reference internal" href="#zero-clause-bsd-license-for-code-in-the-python-release-documentation">ZERO-CLAUSE BSD LICENSE FOR CODE IN THE PYTHON 3.13.0 DOCUMENTATION</a></li> </ul> </li> <li><a class="reference internal" href="#licenses-and-acknowledgements-for-incorporated-software">Licenses and Acknowledgements for Incorporated Software</a><ul> <li><a class="reference internal" href="#mersenne-twister">Mersenne Twister</a></li> <li><a class="reference internal" href="#sockets">Sockets</a></li> <li><a class="reference internal" href="#asynchronous-socket-services">Asynchronous socket services</a></li> <li><a class="reference internal" href="#cookie-management">Cookie management</a></li> <li><a class="reference internal" href="#execution-tracing">Execution tracing</a></li> <li><a class="reference internal" href="#uuencode-and-uudecode-functions">UUencode and UUdecode functions</a></li> <li><a class="reference internal" href="#xml-remote-procedure-calls">XML Remote Procedure Calls</a></li> <li><a class="reference internal" href="#test-epoll">test_epoll</a></li> <li><a class="reference internal" href="#select-kqueue">Select kqueue</a></li> <li><a class="reference internal" href="#siphash24">SipHash24</a></li> <li><a class="reference internal" href="#strtod-and-dtoa">strtod and dtoa</a></li> <li><a class="reference internal" href="#openssl">OpenSSL</a></li> <li><a class="reference internal" href="#expat">expat</a></li> <li><a class="reference internal" href="#libffi">libffi</a></li> <li><a class="reference internal" href="#zlib">zlib</a></li> <li><a class="reference internal" href="#cfuhash">cfuhash</a></li> <li><a class="reference internal" href="#libmpdec">libmpdec</a></li> <li><a class="reference internal" href="#w3c-c14n-test-suite">W3C C14N test suite</a></li> <li><a class="reference internal" href="#mimalloc">mimalloc</a></li> <li><a class="reference internal" href="#asyncio">asyncio</a></li> <li><a class="reference internal" href="#global-unbounded-sequences-gus">Global Unbounded Sequences (GUS)</a></li> </ul> </li> </ul> </li> </ul> </div> <div> <h4>Previous topic</h4> <p class="topless"><a href="copyright.html" title="previous chapter">Copyright</a></p> </div> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/main/Doc/license.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> <div id="sidebarbutton" title="Collapse sidebar"> <span>«</span> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="Related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="copyright.html" title="Copyright" >previous</a> |</li> <li><img src="_static/py.svg" alt="Python logo" style="vertical-align: middle; 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