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A. HISTORY OF THE SOFTWARE |
========================== |
Python was created in the early 1990s by Guido van Rossum at Stichting |
Mathematisch Centrum (CWI, see https://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 https://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 https://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, 2023 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 |
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