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Python3

A. HISTORY OF THE SOFTWARE

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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 (now Zope Corporation, see http://www.zope.com).

In 2001, the Python Software Foundation (PSF, see http://www.python.org/psf/) was

formed, a non-profit organization created specifically to own Python-related Intellectual

Property. Zope Corporation is 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

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PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2

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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

2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 Python Software

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.