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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485  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. 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 use, which is precisely where it is most unacceptable. Therefore, we have designed this version of the GPL to prohibit the practice for those products. If such problems arise substantially in other domains, we 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 software on general-purpose computers, but in those that do, we wish to 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. 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