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COPYING.txt
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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!).
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:
SOFTWARE LICENSE
-----------------------------------------------------------------------
atlas Modified BSD
boehm_gc MIT-like license (see below)
boost_cropped Boost Software License (see below)
bzip2 BSD-ish (see below)
cddlib GPLv2+
cephes "may be used freely" (see below)
cliquer GPLv2+
conway_polynomials None (database)
cvxopt GPLv2+
cython Apache, version 2.0
dateutil Simplified BSD
docutils Modified BSD
ecl LGPLv2+
eclib GPLv2+
ecm GPLv3+
elliptic_curves None (database)
extcode GPLv2+
fflas_ffpack LGPLv2.1+
flint GPLv2+
flintqs GPLv2+
freetype FreeType License (similar to BSD; see below)
gap GPLv2+
gcc GPLv3+
gd Custom (BSD-ish)
gdmodule Custom (BSD-ish)
genus2reduction GPLv2+
gfan GPLv2 or GPLv3
gf2x GPLv2+
givaro CeCILL-B (BSD-ish)
glpk GPLv3+
graphs None (database)
gsl GPLv3+
iconv GPLv3+
iml COPYING is GPLv2, source files state modified BSD
ipython Modified BSD
jinja2 Modified BSD
jmol LGPLv2.1+
lcalc GPLv2+
libfplll LGPLv2.1+
libgap GPLv3+
libpng Custom, very similar to zlib
linbox LGPLv2.1+
lrcalc GPLv2+
m4ri GPLv2+
m4rie GPLv2+
matplotlib Matplotlib License (BSD compatible, see below)
maxima See below
mpc LGPLv3+
mpfi COPYING is GPLv2, source files state LGPLv2.1+
mpfr LGPLv3+
mpir LGPLv3+
mpmath Modified BSD
networkx Modified BSD
ntl GPLv2+
numpy Modified BSD
palp GPLv3
pari GPLv2+
patch GPLv2+
pexpect Python License
pillow Apache License 2.0
pip MIT License
pkgconf ISC License (equivalent to Simplified BSD)
pkgconfig MIT License
polybori GPLv2+
polytopes_db None (database)
ppl GPLv3+
pycrypto Public domain & Python License
pygments Modified BSD
pynac GPLv2+
pyparsing MIT License
python Python License (see below)
R GPLv2+
ratpoints GPLv2+
readline GPLv3+
rpy GPLv2+
rubiks/dietz GPL, any version
rubiks/dik MIT License
rubiks/reid GPLv2+
sage GPLv2+
sage_root GPLv2+
sage_scripts GPLv2+
sagenb GPLv3
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
sqlalchemy MIT License
sqlite Public Domain (see below)
symmetrica MIT-like License (see below)
sympow Modified BSD
sympy Modified BSD
tachyon Modified BSD
termcap GPLv2+
tornado Apache License
zlib Custom (Modified BSD)
zn_poly GPLv2 or GPLv3 (no later versions, see below)
CONTACT INFO:
William Stein; wstein@gmail.com;
http://www.sagemath.org
=========================================================================
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
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17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
================================================================================
boehm_gc:
Copyright (c) 1988, 1989 Hans-J. Boehm, Alan J. Demers
Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
Copyright (c) 1999-2011 by Hewlett-Packard Development Company.
The file linux_threads.c is also
Copyright (c) 1998 by Fergus Henderson. All rights reserved.
The files Makefile.am, and configure.in are
Copyright (c) 2001 by Red Hat Inc. All rights reserved.
Several files supporting GNU-style builds are copyrighted by the Free
Software Foundation, and carry a different license from that given
below. The files included in the libatomic_ops distribution (included
here) use either the license below, or a similar MIT-style license,
or, for some files not actually used by the garbage-collector library, the
GPL.
THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
Permission is hereby granted to use or copy this program
for any purpose, provided the above notices are retained on all copies.
Permission to modify the code and to distribute modified code is granted,
provided the above notices are retained, and a notice that the code was
modified is included with the above copyright notice.
A few of the files needed to use the GNU-style build procedure come with
slightly different licenses, though they are all similar in spirit. A few
are GPL'ed, but with an exception that should cover all uses in the
collector. (If you are concerned about such things, I recommend you look
at the notice in config.guess or ltmain.sh.)
The atomic_ops library contains some code that is covered by the GNU General
Public License, but is not needed by, nor linked into the collector library.
It is included here only becuase the atomic_ops distribution is, for
simplicity, included in its entirety.
================================================================================
boost_cropped:
(http://www.boost.org/LICENSE_1_0.txt)
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
================================================================================
bzip2:
(http://www.bzip.org/)
This program, "bzip2", the associated library "libbzip2", and all
documentation, are copyright (C) 1996-2010 Julian R Seward. All
rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product
documentation would be appreciated but is not required.
3. Altered source versions must be plainly marked as such, and must
not be misrepresented as being the original software.
4. The name of the author may not be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
================================================================================
cephes:
Some software in this archive may be from the book _Methods and
Programs for Mathematical Functions_ (Prentice-Hall, 1989) or
from the Cephes Mathematical Library, a commercial product. In
either event, it is copyrighted by the author. What you see here
may be used freely but it comes with no support or guarantee.
================================================================================
cython:
(http://www.cython.org/)
The original Pyrex code as of 2006-04 is licensed under the following
license: "Copyright stuff: Pyrex is free of restrictions. You may use,
redistribute, modify and distribute modified versions."
------------------
Cython, which derives from Pyrex, is licensed under the Apache 2.0
Software License. More precisely, all modifications and new code
made to go from Pyrex to Cython are so licensed.
See LICENSE.txt in the cython spkg for more details.
================================================================================
docutils:
:Author: David Goodger
:Contact: goodger@python.org
:Date: $Date: 2009-10-09 09:17:59 +0200 (Fre, 09 Okt 2009) $
:Web site: http://docutils.sourceforge.net/
Most of the files included in this project have been placed in the
public domain, and therefore have no license requirements and no
restrictions on copying or usage. See COPYING.txt (in the docutils
spkg) for more details.
================================================================================
freetype:
(http://www.freetype.org/license.html)
FreeType comes with two licenses from which you can choose the one which fits
your needs best.
* The FreeType License (FTL) is the most commonly used one. It is a BSD-style
license with a credit clause and thus compatible with the GNU Public License
(GPL) version 3, but not with the GPL version 2.
* The GNU General Public License (GPL), version 2. Use it for all projects
which use the GPLv2 also, or which need a license compatible to the GPLv2.
================================================================================
gd -- "The web site programmer's dynamic graphics generation tool":
(http://www.boutell.com/gd/)
Permission has been granted to copy, distribute and modify gd in
any context without fee, including a commercial application,
provided that this notice is present in user-accessible supporting
documentation.
This does not affect your ownership of the derived work itself, and
the intent is to assure proper credit for the authors of gd, not to
interfere with your productive use of gd. If you have questions,
ask. "Derived works" includes all programs that utilize the
library. Credit must be given in user-accessible documentation.
This software is provided "AS IS." The copyright holders disclaim
all warranties, either express or implied, including but not
limited to implied warranties of merchantability and fitness for a
particular purpose, with respect to this code and accompanying
documentation.
================================================================================
gdmodule:
(http://newcenturycomputers.net/projects/gdmodule.html)
Permission granted for unlimited use, provided that the Quest Center
at Cold Spring Harbor Labs is given credit for the library in the
user-visible documentation of your software. If you modify gd, we ask
that you share the modifications with us so they can be added to the
distribution. See gd.html for details. (The rest of the notice is in
the package gdmodule spkg, which is a bzip2'd tarball included in the
Sage source distribution.)
================================================================================
genus2reduction:
(http://www.math.u-bordeaux.fr/~liu/G2R/)
Copyright Qing LIU. See PARI for the license terms.
================================================================================
gfan:
From: Anders Nedergaard Jensen <jensen@imf.au.dk>
To: Jeroen Demeyer <jdemeyer@cage.ugent.be>
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?
Best regards,
Anders
================================================================================
ipython:
(http://ipython.org/ipython-doc/stable/about/license_and_copyright.html)
Copyright (c) 2011, IPython Development Team
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
Neither the name of the IPython Development Team nor the names of its
contributors may be used to endorse or promote products derived from this