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Guido van Rossum3225c1f2001-03-22 15:41:06 +00001A. HISTORY OF THE SOFTWARE
2==========================
Guido van Rossumea70b492000-09-01 19:51:14 +00003
4Python was created in the early 1990s by Guido van Rossum at Stichting
Guido van Rossum7b4dd762001-07-17 20:14:06 +00005Mathematisch Centrum (CWI, see http://www.cwi.nl) in the Netherlands
6as a successor of a language called ABC. Guido remains Python's
7principal author, although it includes many contributions from others.
Guido van Rossum3225c1f2001-03-22 15:41:06 +00008
Guido van Rossum7b4dd762001-07-17 20:14:06 +00009In 1995, Guido continued his work on Python at the Corporation for
10National Research Initiatives (CNRI, see http://www.cnri.reston.va.us)
11in Reston, Virginia where he released several versions of the
12software.
Guido van Rossumea70b492000-09-01 19:51:14 +000013
Guido van Rossum7b4dd762001-07-17 20:14:06 +000014In May 2000, Guido and the Python core development team moved to
15BeOpen.com to form the BeOpen PythonLabs team. In October of the same
Guido van Rossum2e1c09c2002-04-04 17:52:50 +000016year, the PythonLabs team moved to Digital Creations (now Zope
17Corporation, see http://www.zope.com). In 2001, the Python Software
18Foundation (PSF, see http://www.python.org/psf/) was formed, a
19non-profit organization created specifically to own Python-related
20Intellectual Property. Zope Corporation is a sponsoring member of
21the PSF.
Guido van Rossum7b4dd762001-07-17 20:14:06 +000022
23All Python releases are Open Source (see http://www.opensource.org for
24the Open Source Definition). Historically, most, but not all, Python
25releases have also been GPL-compatible; the table below summarizes
26the various releases.
27
28 Release Derived Year Owner GPL-
Tim Peters7cb13a92004-10-23 03:48:57 +000029 from compatible? (1)
Guido van Rossum7b4dd762001-07-17 20:14:06 +000030
31 0.9.0 thru 1.2 1991-1995 CWI yes
32 1.3 thru 1.5.2 1.2 1995-1999 CNRI yes
33 1.6 1.5.2 2000 CNRI no
34 2.0 1.6 2000 BeOpen.com no
Guido van Rossum7df772b2002-04-11 20:54:35 +000035 1.6.1 1.6 2001 CNRI yes (2)
Guido van Rossum7b4dd762001-07-17 20:14:06 +000036 2.1 2.0+1.6.1 2001 PSF no
37 2.0.1 2.0+1.6.1 2001 PSF yes
38 2.1.1 2.1+2.0.1 2001 PSF yes
39 2.2 2.1.1 2001 PSF yes
Tim Petersb0f3cea2002-04-08 21:36:47 +000040 2.1.2 2.1.1 2002 PSF yes
41 2.1.3 2.1.2 2002 PSF yes
42 2.2.1 2.2 2002 PSF yes
Tim Peters638a1e22002-10-06 04:04:46 +000043 2.2.2 2.2.1 2002 PSF yes
Barry Warsaw7d7f88c2003-05-22 15:17:40 +000044 2.2.3 2.2.2 2003 PSF yes
Guido van Rossumf1226882002-12-31 01:50:07 +000045 2.3 2.2.2 2002-2003 PSF yes
Anthony Baxter9d42a102003-09-23 02:42:29 +000046 2.3.1 2.3 2002-2003 PSF yes
Anthony Baxterc2b00812003-09-30 07:07:08 +000047 2.3.2 2.3.1 2002-2003 PSF yes
Tim Peters926bc222004-05-11 18:13:10 +000048 2.3.3 2.3.2 2002-2003 PSF yes
49 2.3.4 2.3.3 2004 PSF yes
Anthony Baxter94d62012005-03-10 13:47:17 +000050 2.3.5 2.3.4 2005 PSF yes
Anthony Baxterbd377a32004-07-08 05:57:59 +000051 2.4 2.3 2004 PSF yes
Anthony Baxter94d62012005-03-10 13:47:17 +000052 2.4.1 2.4 2005 PSF yes
Georg Brandlcfc34712005-10-21 07:53:44 +000053 2.4.2 2.4.1 2005 PSF yes
Thomas Wouters49fd7fa2006-04-21 10:40:58 +000054 2.4.3 2.4.2 2006 PSF yes
Guido van Rossumd8faa362007-04-27 19:54:29 +000055 2.4.4 2.4.3 2006 PSF yes
Thomas Wouters49fd7fa2006-04-21 10:40:58 +000056 2.5 2.4 2006 PSF yes
Guido van Rossumd8faa362007-04-27 19:54:29 +000057 2.5.1 2.5 2007 PSF yes
Benjamin Peterson6ebe78f2008-12-21 00:06:59 +000058 2.5.2 2.5.1 2008 PSF yes
59 2.5.3 2.5.2 2008 PSF yes
Barry Warsaw659fc422008-03-01 17:45:23 +000060 2.6 2.5 2008 PSF yes
Benjamin Peterson6ebe78f2008-12-21 00:06:59 +000061 2.6.1 2.6 2008 PSF yes
Benjamin Petersond94dfe82009-12-13 14:21:46 +000062 2.6.2 2.6.1 2009 PSF yes
63 2.6.3 2.6.2 2009 PSF yes
64 2.6.4 2.6.3 2009 PSF yes
Benjamin Peterson08bf91c2010-04-11 16:12:57 +000065 2.6.5 2.6.4 2010 PSF yes
Barry Warsaw97f005d2008-12-03 16:46:14 +000066 3.0 2.6 2008 PSF yes
Benjamin Petersonad224bd2009-12-13 14:26:42 +000067 3.0.1 3.0 2009 PSF yes
68 3.1 3.0.1 2009 PSF yes
69 3.1.1 3.1 2009 PSF yes
Georg Brandl96d237c2011-08-13 11:59:12 +020070 3.1.2 3.1.1 2010 PSF yes
71 3.1.3 3.1.2 2010 PSF yes
72 3.1.4 3.1.3 2011 PSF yes
Georg Brandled138532010-12-31 23:00:03 +000073 3.2 3.1 2011 PSF yes
Georg Brandl96d237c2011-08-13 11:59:12 +020074 3.2.1 3.2 2011 PSF yes
75 3.2.2 3.2.1 2011 PSF yes
Georg Brandlf125bf52012-03-04 16:26:19 +010076 3.3.0 3.2 2012 PSF yes
Guido van Rossum7b4dd762001-07-17 20:14:06 +000077
78Footnotes:
79
80(1) GPL-compatible doesn't mean that we're distributing Python under
81 the GPL. All Python licenses, unlike the GPL, let you distribute
82 a modified version without making your changes open source. The
83 GPL-compatible licenses make it possible to combine Python with
84 other software that is released under the GPL; the others don't.
Guido van Rossum3225c1f2001-03-22 15:41:06 +000085
Guido van Rossum7df772b2002-04-11 20:54:35 +000086(2) According to Richard Stallman, 1.6.1 is not GPL-compatible,
87 because its license has a choice of law clause. According to
88 CNRI, however, Stallman's lawyer has told CNRI's lawyer that 1.6.1
89 is "not incompatible" with the GPL.
90
Guido van Rossum3225c1f2001-03-22 15:41:06 +000091Thanks to the many outside volunteers who have worked under Guido's
92direction to make these releases possible.
Guido van Rossumea70b492000-09-01 19:51:14 +000093
Guido van Rossumea70b492000-09-01 19:51:14 +000094
Guido van Rossumaa815df2001-04-10 03:37:31 +000095B. TERMS AND CONDITIONS FOR ACCESSING OR OTHERWISE USING PYTHON
96===============================================================
Guido van Rossum3225c1f2001-03-22 15:41:06 +000097
Tim Petersacaffe62004-10-23 03:43:54 +000098PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
99--------------------------------------------
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000100
1011. This LICENSE AGREEMENT is between the Python Software Foundation
102("PSF"), and the Individual or Organization ("Licensee") accessing and
Tim Peterscb919002004-10-26 14:38:48 +0000103otherwise using this software ("Python") in source or binary form and
104its associated documentation.
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000105
Georg Brandlb1441c72009-01-03 22:33:39 +00001062. Subject to the terms and conditions of this License Agreement, PSF hereby
107grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
108analyze, test, perform and/or display publicly, prepare derivative works,
109distribute, and otherwise use Python alone or in any derivative version,
110provided, however, that PSF's License Agreement and PSF's notice of copyright,
Georg Brandled138532010-12-31 23:00:03 +0000111i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
Benjamin Petersonf606e682011-12-31 22:42:26 -06001122011, 2012 Python Software Foundation; All Rights Reserved" are retained in Python
Georg Brandled138532010-12-31 23:00:03 +0000113alone or in any derivative version prepared by Licensee.
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000114
1153. In the event Licensee prepares a derivative work that is based on
Tim Petersacaffe62004-10-23 03:43:54 +0000116or incorporates Python or any part thereof, and wants to make
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000117the derivative work available to others as provided herein, then
118Licensee hereby agrees to include in any such work a brief summary of
Tim Petersacaffe62004-10-23 03:43:54 +0000119the changes made to Python.
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000120
Tim Petersacaffe62004-10-23 03:43:54 +00001214. PSF is making Python available to Licensee on an "AS IS"
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000122basis. PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
123IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND
124DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
Tim Petersacaffe62004-10-23 03:43:54 +0000125FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000126INFRINGE ANY THIRD PARTY RIGHTS.
127
1285. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
Tim Petersacaffe62004-10-23 03:43:54 +0000129FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
130A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000131OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
132
1336. This License Agreement will automatically terminate upon a material
134breach of its terms and conditions.
135
Guido van Rossum648b4de2001-05-04 18:49:06 +00001367. Nothing in this License Agreement shall be deemed to create any
137relationship of agency, partnership, or joint venture between PSF and
138Licensee. This License Agreement does not grant permission to use PSF
139trademarks or trade name in a trademark sense to endorse or promote
140products or services of Licensee, or any third party.
Guido van Rossum9ea60c52001-04-13 15:04:00 +0000141
Tim Petersacaffe62004-10-23 03:43:54 +00001428. By copying, installing or otherwise using Python, Licensee
Guido van Rossum859d9b52001-04-13 19:41:28 +0000143agrees to be bound by the terms and conditions of this License
144Agreement.
145
Guido van Rossum575d7f32001-04-13 15:04:31 +0000146
Guido van Rossum7b4dd762001-07-17 20:14:06 +0000147BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0
148-------------------------------------------
Guido van Rossum028d0692000-09-03 03:13:44 +0000149
Guido van Rossum2e0d3312000-09-04 00:58:48 +0000150BEOPEN PYTHON OPEN SOURCE LICENSE AGREEMENT VERSION 1
Guido van Rossumea70b492000-09-01 19:51:14 +0000151
Guido van Rossum028d0692000-09-03 03:13:44 +00001521. This LICENSE AGREEMENT is between BeOpen.com ("BeOpen"), having an
153office at 160 Saratoga Avenue, Santa Clara, CA 95051, and the
Guido van Rossumea70b492000-09-01 19:51:14 +0000154Individual or Organization ("Licensee") accessing and otherwise using
155this software in source or binary form and its associated
156documentation ("the Software").
157
Guido van Rossum028d0692000-09-03 03:13:44 +00001582. Subject to the terms and conditions of this BeOpen Python License
159Agreement, BeOpen hereby grants Licensee a non-exclusive,
160royalty-free, world-wide license to reproduce, analyze, test, perform
161and/or display publicly, prepare derivative works, distribute, and
162otherwise use the Software alone or in any derivative version,
163provided, however, that the BeOpen Python License is retained in the
164Software, alone or in any derivative version prepared by Licensee.
Guido van Rossumea70b492000-09-01 19:51:14 +0000165
Guido van Rossum82271162000-09-05 03:05:07 +00001663. BeOpen is making the Software available to Licensee on an "AS IS"
Guido van Rossumea70b492000-09-01 19:51:14 +0000167basis. BEOPEN MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
168IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, BEOPEN MAKES NO AND
169DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
170FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF THE SOFTWARE WILL NOT
171INFRINGE ANY THIRD PARTY RIGHTS.
172
Guido van Rossum82271162000-09-05 03:05:07 +00001734. BEOPEN SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF THE
Guido van Rossumea70b492000-09-01 19:51:14 +0000174SOFTWARE FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS
175AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE SOFTWARE, OR ANY
176DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
177
Guido van Rossum82271162000-09-05 03:05:07 +00001785. This License Agreement will automatically terminate upon a material
Guido van Rossumea70b492000-09-01 19:51:14 +0000179breach of its terms and conditions.
180
Guido van Rossum82271162000-09-05 03:05:07 +00001816. This License Agreement shall be governed by and interpreted in all
Guido van Rossumea70b492000-09-01 19:51:14 +0000182respects by the law of the State of California, excluding conflict of
183law provisions. Nothing in this License Agreement shall be deemed to
184create any relationship of agency, partnership, or joint venture
185between BeOpen and Licensee. This License Agreement does not grant
Guido van Rossumac1c8182000-09-03 13:21:38 +0000186permission to use BeOpen trademarks or trade names in a trademark
187sense to endorse or promote products or services of Licensee, or any
188third party. As an exception, the "BeOpen Python" logos available at
Guido van Rossum028d0692000-09-03 03:13:44 +0000189http://www.pythonlabs.com/logos.html may be used according to the
190permissions granted on that web page.
Guido van Rossumea70b492000-09-01 19:51:14 +0000191
Guido van Rossum82271162000-09-05 03:05:07 +00001927. By copying, installing or otherwise using the software, Licensee
Guido van Rossumea70b492000-09-01 19:51:14 +0000193agrees to be bound by the terms and conditions of this License
194Agreement.
195
196
Guido van Rossum7b4dd762001-07-17 20:14:06 +0000197CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1
198---------------------------------------
Guido van Rossumea761c02000-10-10 14:49:44 +0000199
2001. This LICENSE AGREEMENT is between the Corporation for National
201Research Initiatives, having an office at 1895 Preston White Drive,
202Reston, VA 20191 ("CNRI"), and the Individual or Organization
Guido van Rossum3225c1f2001-03-22 15:41:06 +0000203("Licensee") accessing and otherwise using Python 1.6.1 software in
204source or binary form and its associated documentation.
Guido van Rossumea761c02000-10-10 14:49:44 +0000205
2062. Subject to the terms and conditions of this License Agreement, CNRI
207hereby grants Licensee a nonexclusive, royalty-free, world-wide
208license to reproduce, analyze, test, perform and/or display publicly,
Guido van Rossum3225c1f2001-03-22 15:41:06 +0000209prepare derivative works, distribute, and otherwise use Python 1.6.1
Guido van Rossumea761c02000-10-10 14:49:44 +0000210alone or in any derivative version, provided, however, that CNRI's
211License Agreement and CNRI's notice of copyright, i.e., "Copyright (c)
Guido van Rossum3225c1f2001-03-22 15:41:06 +00002121995-2001 Corporation for National Research Initiatives; All Rights
213Reserved" are retained in Python 1.6.1 alone or in any derivative
214version prepared by Licensee. Alternately, in lieu of CNRI's License
215Agreement, Licensee may substitute the following text (omitting the
216quotes): "Python 1.6.1 is made available subject to the terms and
217conditions in CNRI's License Agreement. This Agreement together with
218Python 1.6.1 may be located on the Internet using the following
219unique, persistent identifier (known as a handle): 1895.22/1013. This
220Agreement may also be obtained from a proxy server on the Internet
221using the following URL: http://hdl.handle.net/1895.22/1013".
Guido van Rossumea761c02000-10-10 14:49:44 +0000222
2233. In the event Licensee prepares a derivative work that is based on
Guido van Rossum3225c1f2001-03-22 15:41:06 +0000224or incorporates Python 1.6.1 or any part thereof, and wants to make
225the derivative work available to others as provided herein, then
226Licensee hereby agrees to include in any such work a brief summary of
227the changes made to Python 1.6.1.
Guido van Rossumea761c02000-10-10 14:49:44 +0000228
Guido van Rossum3225c1f2001-03-22 15:41:06 +00002294. CNRI is making Python 1.6.1 available to Licensee on an "AS IS"
230basis. CNRI MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
231IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, CNRI MAKES NO AND
Guido van Rossumea761c02000-10-10 14:49:44 +0000232DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
Guido van Rossum3225c1f2001-03-22 15:41:06 +0000233FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON 1.6.1 WILL NOT
Guido van Rossumea761c02000-10-10 14:49:44 +0000234INFRINGE ANY THIRD PARTY RIGHTS.
235
2365. CNRI SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
Guido van Rossum3225c1f2001-03-22 15:41:06 +00002371.6.1 FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
238A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 1.6.1,
239OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
Guido van Rossumea761c02000-10-10 14:49:44 +0000240
2416. This License Agreement will automatically terminate upon a material
242breach of its terms and conditions.
243
Guido van Rossum3225c1f2001-03-22 15:41:06 +00002447. This License Agreement shall be governed by the federal
245intellectual property law of the United States, including without
246limitation the federal copyright law, and, to the extent such
247U.S. federal law does not apply, by the law of the Commonwealth of
248Virginia, excluding Virginia's conflict of law provisions.
249Notwithstanding the foregoing, with regard to derivative works based
250on Python 1.6.1 that incorporate non-separable material that was
251previously distributed under the GNU General Public License (GPL), the
252law of the Commonwealth of Virginia shall govern this License
253Agreement only as to issues arising under or with respect to
254Paragraphs 4, 5, and 7 of this License Agreement. Nothing in this
255License Agreement shall be deemed to create any relationship of
256agency, partnership, or joint venture between CNRI and Licensee. This
257License Agreement does not grant permission to use CNRI trademarks or
258trade name in a trademark sense to endorse or promote products or
259services of Licensee, or any third party.
Guido van Rossumea761c02000-10-10 14:49:44 +0000260
2618. By clicking on the "ACCEPT" button where indicated, or by copying,
Guido van Rossum3225c1f2001-03-22 15:41:06 +0000262installing or otherwise using Python 1.6.1, Licensee agrees to be
263bound by the terms and conditions of this License Agreement.
Guido van Rossumea761c02000-10-10 14:49:44 +0000264
Guido van Rossum3225c1f2001-03-22 15:41:06 +0000265 ACCEPT
Guido van Rossumea70b492000-09-01 19:51:14 +0000266
267
Guido van Rossum7b4dd762001-07-17 20:14:06 +0000268CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2
269--------------------------------------------------
Guido van Rossumea70b492000-09-01 19:51:14 +0000270
271Copyright (c) 1991 - 1995, Stichting Mathematisch Centrum Amsterdam,
272The Netherlands. All rights reserved.
273
274Permission to use, copy, modify, and distribute this software and its
275documentation for any purpose and without fee is hereby granted,
276provided that the above copyright notice appear in all copies and that
277both that copyright notice and this permission notice appear in
278supporting documentation, and that the name of Stichting Mathematisch
279Centrum or CWI not be used in advertising or publicity pertaining to
280distribution of the software without specific, written prior
281permission.
282
283STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
284THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
285FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
286FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
287WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
288ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
289OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.