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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!).

All Sage documentation is licensed under Creative Commons 3.0 BY-SA
License.

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
-----------------------------------------------------------------------
arb                         GPLv2+
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)
cddlib                      GPLv2+
cephes                      "may be used freely" (see below)
certifi                     ISC
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+
fplll                       LGPLv2.1+
freetype                    FreeType License (similar to BSD; see below)
gap                         GPLv2+
gcc                         GPLv3+
gd                          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+
jsonschema                  MIT License
lcalc                       GPLv2+
libgap                      GPLv3+
libpng                      Custom, very similar to zlib
linbox                      LGPLv2.1+
lrcalc                      GPLv2+
m4ri                        GPLv2+
m4rie                       GPLv2+
markupsafe                  Simplified BSD
mathjax                     Apache License 2.0
matplotlib                  Matplotlib License (BSD compatible, see below)
maxima                      See below
mistune                     Modified BSD
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
openblas                    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
planarity                   Modified BSD
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
sqlite                      Public Domain (see below)
symmetrica                  MIT-like License (see below)
sympow                      Modified BSD
sympy                       Modified BSD
tachyon                     Modified BSD
termcap                     GPLv2+
threejs                     MIT License
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

  The GNU General Public License is a free, copyleft license for
software and other kinds of works.

  The licenses for most software and other practical works are designed
to take away your freedom to share and change the works.  By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users.  We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors.  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.

  To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights.  Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.

  For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received.  You must make sure that they, too, receive
or can get the source code.  And you must show them these terms so they
know their rights.

  Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.

  For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software.  For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.

  Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so.  This is fundamentally incompatible with the aim of
protecting users' freedom to change the software.  The systematic
pattern of such abuse occurs in the area of products for individuals to
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have designed this version of the GPL to prohibit the practice for those
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stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.

  Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
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avoid the special danger that patents applied to a free program could
make it effectively proprietary.  To prevent this, the GPL assures that
patents cannot be used to render the program non-free.

  The precise terms and conditions for copying, distribution and
modification follow.

                       TERMS AND CONDITIONS

  0. Definitions.

  "This License" refers to version 3 of the GNU General Public License.

  "Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.

  "The Program" refers to any copyrightable work licensed under this
License.  Each licensee is addressed as "you".  "Licensees" and
"recipients" may be individuals or organizations.

  To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy.  The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.

  A "covered work" means either the unmodified Program or a work based
on the Program.

  To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy.  Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.

  To "convey" a work means any kind of propagation that enables other
parties to make or receive copies.  Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.

  An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License.  If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.

  1. Source Code.

  The "source code" for a work means the preferred form of the work
for making modifications to it.  "Object code" means any non-source
form of a work.

  A "Standard Interface" means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.

  The "System Libraries" of an executable work include anything, other
than the work as a whole, that (a) is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and (b) serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form.  A
"Major Component", in this context, means a major essential component
(kernel, window system, and so on) of the specific operating system
(if any) on which the executable work runs, or a compiler used to
produce the work, or an object code interpreter used to run it.

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