This Project is licensed under the three-clause BSD license; see the file
LICENSE for details.

This Project includes code from the Python standard library, which is licensed under
the Python license, a permissive open source license. The copyright and license
is included below for compliance with Python's terms.

---

Copyright (c) 2001-present Python Software Foundation; All Rights Reserved

# A. HISTORY OF THE SOFTWARE

Python was created in the early 1990s by Guido van Rossum at Stichting
Mathematisch Centrum (CWI, see http://www.cwi.nl) in the Netherlands
as a successor of a language called ABC. Guido remains Python's
principal author, although it includes many contributions from others.

In 1995, Guido continued his work on Python at the Corporation for
National Research Initiatives (CNRI, see http://www.cnri.reston.va.us)
in Reston, Virginia where he released several versions of the
software.

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, which became
Zope Corporation. In 2001, the Python Software Foundation (PSF, see
https://www.python.org/psf/) was formed, a non-profit organization
created specifically to own Python-related Intellectual Property.
Zope Corporation was a sponsoring member of the PSF.

All Python releases are Open Source (see http://www.opensource.org for
the Open Source Definition). Historically, most, but not all, Python
releases have also been GPL-compatible; the table below summarizes
the various releases.

    Release         Derived     Year        Owner       GPL-
                    from                                compatible? (1)

    0.9.0 thru 1.2              1991-1995   CWI         yes
    1.3 thru 1.5.2  1.2         1995-1999   CNRI        yes
    1.6             1.5.2       2000        CNRI        no
    2.0             1.6         2000        BeOpen.com  no
    1.6.1           1.6         2001        CNRI        yes (2)
    2.1             2.0+1.6.1   2001        PSF         no
    2.0.1           2.0+1.6.1   2001        PSF         yes
    2.1.1           2.1+2.0.1   2001        PSF         yes
    2.1.2           2.1.1       2002        PSF         yes
    2.1.3           2.1.2       2002        PSF         yes
    2.2 and above   2.1.1       2001-now    PSF         yes

Footnotes:

(1) 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.

(2) According to Richard Stallman, 1.6.1 is not GPL-compatible,
because its license has a choice of law clause. According to
CNRI, however, Stallman's lawyer has told CNRI's lawyer that 1.6.1
is "not incompatible" with the GPL.

Thanks to the many outside volunteers who have worked under Guido's
direction to make these releases possible.

# B. TERMS AND CONDITIONS FOR ACCESSING OR OTHERWISE USING PYTHON

Python software and documentation are licensed under the
Python Software Foundation License Version 2.

Starting with Python 3.8.6, examples, recipes, and other code in
the documentation are dual licensed under the PSF License Version 2
and the Zero-Clause BSD license.

Some software incorporated into Python is under different licenses.
The licenses are listed with code falling under that license.

## 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 (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 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.

## BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0

BEOPEN PYTHON OPEN SOURCE LICENSE AGREEMENT VERSION 1

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.

## CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1

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 (c)
    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.

            ACCEPT

## CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2

Copyright (c) 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.
