历史和许可证 — Python 3.14.5 文档
Description: 该软件的历史: Python 是在 1990 年代初由 Guido van Rossum 在荷兰的 Stichting Mathematisch Centrum (CWI，见 https://www.cwi.nl) 作为一门名为 ABC 的语言的后继者创造的。 Guido 仍然是 Python 的主要作者，尽管它也包括了许多来自其他人的贡献。 在 1995 年，Guido 在弗吉尼亚州 Re...

# 历史和许可证

## 该软件的历史

Python 是在 1990 年代初由 Guido van Rossum 在荷兰的 Stichting Mathematisch Centrum (CWI，见 https://www.cwi.nl) 作为一门名为 ABC 的语言的后继者创造的。 Guido 仍然是 Python 的主要作者，尽管它也包括了许多来自其他人的贡献。

在 1995 年，Guido 在弗吉尼亚州 Reston 市的 Corporation for National Research Initiatives (CNRI，见 https://www.cnri.reston.va.us) 继续他对 Python 的工作，他在那里发布了该软件的多个版本。

在 2000 年 5 月，Guido 和 Python 核心开发团队移至 BeOpen.com 组建了 BeOpen PythonLabs 团队。 同年 10 月，PythonLabs 团队移至 Digital Creations，后改名为 Zope Corporation。 在 2001 年，Python Software Foundation (PSF，见 https://www.python.org/psf/) 成立，这是一个专门为持有与 Python 相关的知识产权而创立的非营利组织。 Zope Corporation 是 PSF 的一个赞助成员。

所有 Python 发布版都是开源的 (有关开源的定义见 https://opensource.org)。 在历史上，大多数但并非全部 Python 发布版还是 GPL 兼容的；下表总结了各个版本的情况。

发布版本 | 源自 | 年份 | 所有者 | GPL 兼容? (1)
--- | --- | --- | --- | ---
0.9.0 至 1.2 | n/a | 1991-1995 | CWI | 是
1.3 至 1.5.2 | 1.2 | 1995-1999 | CNRI | 是
1.6 | 1.5.2 | 2000 | CNRI | 否
2.0 | 1.6 | 2000 | BeOpen.com | 否
1.6.1 | 1.6 | 2001 | CNRI | 是 (2)
2.1 | 2.0+1.6.1 | 2001 | PSF | 否
2.0.1 | 2.0+1.6.1 | 2001 | PSF | 是
2.1.1 | 2.1+2.0.1 | 2001 | PSF | 是
2.1.2 | 2.1.1 | 2002 | PSF | 是
2.1.3 | 2.1.2 | 2002 | PSF | 是
2.2 及更高 | 2.1.1 | 2001 至今 | PSF | 是

备注

1. GPL 兼容并不意味着我们是基于 GPL 发布 Python。 与 GPL 不同，所有 Python 许可证都允许你分发经修改的版本而无需开源你所做的修改。 GPL 兼容的许可证使得 Python 可以与其他基于 GPL 发布的软件结合使用；其他许可证则不可以。

2. 按照 Richard Stallman 的说法，1.6.1 不是 GPL 兼容的，因为它的许可证包含特定的法律条款。 但是按照 CNRI 的说法，Stallman 的律师已告诉 CNRI 的律师 1.6.1 与 GPL "并非不兼容"。

感谢众多在 Guido 指导下工作的外部志愿者，使得这些发布成为可能。

## 获取或以其他方式使用 Python 的条款和条件

Python 软件和文档的使用许可均为 Python Software Foundation License Version 2。

从 Python 3.8.6 开始，文档中的示例、操作指导和其他代码均采用 PSF License Version 2 和 Zero-Clause BSD license 双重使用许可。

某些包含在 Python 中的软件基于不同的许可。这些许可会与相应许可之下的代码一同列出。有关这些许可的不完整列表请参阅 收录软件的许可与鸣谢。

### PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2

    1. This LICENSE AGREEMENT is between the Python Software Foundation ("PSF"), and
       the Individual or Organization ("Licensee") accessing and otherwise using this
       software ("Python") 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 alone or in any derivative
       version, provided, however, that PSF's License Agreement and PSF's notice of
       copyright, i.e., "Copyright © 2001 Python Software Foundation; All Rights
       Reserved" are retained in Python 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 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.

    4. PSF is making Python 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 WILL NOT INFRINGE ANY THIRD PARTY RIGHTS.

    5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
       FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF
       MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON, 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, Licensee agrees
       to be bound by the terms and conditions of this License Agreement.

### 用于 PYTHON 2.0 的 BEOPEN.COM 许可协议

BEOPEN PYTHON 开源许可协议第 1 版

    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.

### 用于 PYTHON 1.6.1 的 CNRI 许可协议

    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.

### 用于 PYTHON 0.9.0 至 1.2 的 CWI 许可协议

    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.

### ZERO-CLAUSE BSD LICENSE FOR CODE IN THE PYTHON DOCUMENTATION

    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.

## 收录软件的许可与鸣谢

本节是 Python 发行版中收录的第三方软件的许可和致谢清单，该清单是不完整且不断增长的。

### Mersenne Twister

作为 `random` 模块下层的 `_random` C 扩展包括基于从 http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html 下载的代码。 以下是原始代码的完整注释:

    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)

### 套接字

`socket` 模块使用了来自 WIDE 项目 https://www.wide.ad.jp/ 的单独源文件中的 `getaddrinfo()` 和 `getnameinfo()` 函数:

    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.

### 异步套接字服务

`test.support.asynchat` 和 `test.support.asyncore` 模块包含以下声明:

    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.

### Cookie 管理

`http.cookies` 模块包含以下声明:

    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.

### 执行追踪

`trace` 模块包含以下声明:

    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.

### UUencode 与 UUdecode 函数

`uu` 编解码器包含以下声明:

    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

### XML 远程过程调用

`xmlrpc.client` 模块包含以下声明:

        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.

### test_epoll

`test.test_epoll` 模块包含以下说明:

    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.

### Select kqueue

`select` 模块关于 kqueue 的接口包含以下声明:

    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.

### SipHash24

`Python/pyhash.c` 文件包含 Marek Majkowski 对 Dan Bernstein 的 SipHash24 算法的实现。它包含以下声明:

    <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)

### strtod 和 dtoa

`Python/dtoa.c` 文件提供了 C 函数 dtoa 和 strtod，用于 C 双精度数值和字符串之间的转换，它派生自由 David M. Gay 编写的同名文件。 目前该文件可在 https://web.archive.org/web/20220517033456/http://www.netlib.org/fp/dtoa.c 访问。 在 2009 年 3 月 16 日检索到的原始文件包含以下版权和许可声明:

    /****************************************************************
     *
     * 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.
     *
     ***************************************************************/

### OpenSSL

如果操作系统有支持则 `hashlib`, `posix` 和 `ssl` 会使用 OpenSSL 库来提升性能。 此外，Python 的 Windows 和 macOS 安装程序可能会包括 OpenSSL 库的副本，所以我们也在此包括一份 OpenSSL 许可证的副本。 对于 OpenSSL 3.0 发布版，及其后续衍生版本，均使用 Apache License v2:

                                  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."

       "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

### expat

The `pyexpat` extension is built using an included copy of the expat sources unless the build is configured `--with-system-expat`:

    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.

### libffi

作为 `ctypes` 模块下层的 `_ctypes` C 扩展是使用包括了 libffi 源的副本构建的，除非构建时配置了 `--with-system-libffi`:

    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.

### zlib

如果系统上找到的 zlib 版本太旧而无法用于构建，则使用包含 zlib 源代码的拷贝来构建 `zlib` 扩展:

    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

### cfuhash

`tracemalloc` 使用的哈希表的实现基于 cfuhash 项目:

    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.

### libmpdec

作为 `decimal` 模块下层的 `_decimal` C 扩展是使用包括了 libmpdec 库的副本构建的，除非构建时配置了 `--with-system-libmpdec`:

    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.

### W3C C14N 测试套件

`test` 包中的 C14N 2.0 测试集 (`Lib/test/xmltestdata/c14n-20/`) 提取自 W3C 网站 https://www.w3.org/TR/xml-c14n2-testcases/ 并根据 3 条款版 BSD 许可证发行:

    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.

### mimalloc

MIT 许可证:

    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.

### asyncio

`asyncio` 模块的某些部分来自 uvloop 0.16，它是基于 MIT 许可证发行的:

    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.

### Global Unbounded Sequences (GUS)

文件 `Python/qsbr.c` 改编自 subr_smr.c 中 FreeBSD 的 "Global Unbounded Sequences" 安全内存回收方案。 该文件是基于 2 条款 BSD 许可证分发的:

    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.

### Zstandard 绑定

`Modules/_zstd` 和 `Lib/compression/zstd` 中的 Zstandard 绑定是基于来自 pyzstd 库 的代码，版权属于 Ma Lin 及其他贡献者。 pyzstd 代码的分发采用 3 条款版 BSD 许可证:

    Copyright (c) 2020-present, Ma Lin and contributors.
    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 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.