This file is about the copyright on Sage and all included components.
Sage is a compilation both of original Python, C, C++, and Cython code,
and of existing free mathematics-related software. All standard
components of sage (those included in sage-*.tar) are licensed under a
free open source license as defined at http://www.opensource.org/.
The whole Sage software distribution is licensed under the General
Public License, version 3 (no other versions!).
All Sage documentation is licensed under Creative Commons 3.0 BY-SA
Some of the code available in *optional* Sage packages (not included
in sage-*.tar) are licensed under more restrictive conditions.
* ORIGINAL SAGE LIBRARY CODE:
All original Sage code is distributed under the terms of the
GNU General Public License, either version 2 of the License, or
(at your option) any later version.
This code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
The full text of the GPL is available below in this file. Details of
the licenses of the components of Sage are included below as well.
* LICENSES OF INCLUDED SOFTWARE:
atlas Modified BSD
boehm_gc MIT-like license (see below)
backports_ssl_match_hostname Python License
boost_cropped Boost Software License (see below)
bzip2 BSD-ish (see below)
cephes "may be used freely" (see below)
conway_polynomials None (database)
cython Apache, version 2.0
dateutil Simplified BSD
docutils Modified BSD
elliptic_curves None (database)
freetype FreeType License (similar to BSD; see below)
gd Custom (BSD-ish)
gfan GPLv2 or GPLv3
givaro CeCILL-B (BSD-ish)
graphs None (database)
iml COPYING is GPLv2, source files state modified BSD
ipython Modified BSD
jinja2 Modified BSD
jsonschema MIT License
libpng Custom, very similar to zlib
markupsafe Simplified BSD
mathjax Apache License 2.0
matplotlib Matplotlib License (BSD compatible, see below)
maxima See below
mistune Modified BSD
mpfi COPYING is GPLv2, source files state LGPLv2.1+
mpmath Modified BSD
networkx Modified BSD
numpy Modified BSD
openblas Modified BSD
pexpect Python License
pillow Apache License 2.0
pip MIT License
pkgconf ISC License (equivalent to Simplified BSD)
pkgconfig MIT License
planarity Modified BSD
polytopes_db None (database)
pycrypto Public domain & Python License
pygments Modified BSD
pyparsing MIT License
python Python License (see below)
rubiks/dietz GPL, any version
rubiks/dik MIT License
sagetex GPLv2+ (CC BY-SA 3.0 for included documentation)
scipy Modified BSD
scons MIT License
setuptools Python License
singular GPLv2 or GPLv3 (see below)
six MIT License
sphinx Modified BSD
sqlite Public Domain (see below)
symmetrica MIT-like License (see below)
sympow Modified BSD
sympy Modified BSD
tachyon Modified BSD
threejs MIT License
tornado Apache License
zlib Custom (Modified BSD)
zn_poly GPLv2 or GPLv3 (no later versions, see below)
William Stein; email@example.com;
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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The file linux_threads.c is also
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The atomic_ops library contains some code that is covered by the GNU General
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:Author: David Goodger
:Date: $Date: 2009-10-09 09:17:59 +0200 (Fre, 09 Okt 2009) $
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From: Anders Nedergaard Jensen <firstname.lastname@example.org>
To: Jeroen Demeyer <email@example.com>
Subject: Re: gfan licensing under GPLv2+
Dear Jeroen Demeyer,
Yes, I am willing to change the distribution terms to
GPL, "version 2, or any later version".
Do I need to make an updated release, or will this email suffice?
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Dear Dr. Schelter:
This is in reply to your request of September 17, 1998, requesting a license
to prepare and distribute derivative works from the copy of DOE-MACSYMA
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?It has been the DOE practice (where the case permits) to encourage private
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unrestricted software sponsored or supported by DOE for the purpose of
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If you have questions or comments, please call me at 423/576-2606.
A Library for Doing Number Theory
Copyright (C) 1996-2005 Victor Shoup
The most recent version of NTL is available at http://www.shoup.net
This program is free software; you can redistribute it and/or
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The above terms apply to all of the software modules distributed with NTL,
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Note that the quad_float package is derived from the doubledouble package,
originally developed by Keith Briggs, and also licensed unger the GNU GPL.
The files quad_float.c and quad_float.h contain more detailed copyright
Note that the traditional long integer package used by NTL, lip.c, is derived
from---and represents an extensive modification of---
a package originally developed and copyrighted by Arjen Lenstra,
who has agreed to renounce any copyright claims on the particular
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this package now is covered by the GNU GPL as well.
Note that the alternative long integer package used by NTL is GMP,
which is written by Torbjorn Granlund <firstname.lastname@example.org>.
GMP is licensed under the terms of the GNU Lesser General Public License.
Note that NTL makes use of the RSA Data Security, Inc. MD5 Message
RSA MD5 Message Digest Algorithm License:
Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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License is also granted to make and use derivative works provided
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RSA Data Security, Inc. makes no representations concerning either
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The Python Imaging Library is
Copyright (c) 1997-2006 by Secret Labs AB
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Previously, the copyright and/or licensing status of the Python
Cryptography Toolkit ("PyCrypto") had been somewhat ambiguous. The
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Additionally, some files within PyCrypto had specified their own
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To rectify this situation for PyCrypto 2.1, the following steps have
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already done so. (See the "LEGAL/copy/stmts" directory for
2. Replacing some modules with clearly-licensed code from other
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based on Tom St. Denis's public-domain LibTomCrypt library.)
3. Replacing some modules with code written from scratch (e.g. the
RIPEMD and Blowfish modules were re-implemented from their
respective algorithm specifications without reference to the old
4. Removing some modules altogether without replacing them.
To the best of our knowledge, with the exceptions noted below or
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The contents of this file are dedicated to the public domain. To
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- Portions of HMAC.py and setup.py are derived from Python 2.2, and
are therefore Copyright (c) 2001, 2002, 2003 Python Software
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Note that the export or re-export of cryptographic software and/or
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SINGULAR version 3-1-5
University of Kaiserslautern
Department of Mathematics and Centre for Computer Algebra
Authors: G.-M. Greuel, G. Pfister, H. Schoenemann
Copyright (C) 1986-2012
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