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License Information
GPLv3
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright © 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 licensesfor most softwareand otherpractical works aredesigned totake away yourfreedom
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 freedomto distribute copiesof free software(and charge for themif you wish),that you
receive source code or canget it if you want it, thatyou can change the software or use piecesof
it in new free programs, and that you know you can do these things.
To protect your rights, we need to prevent others fromdenying 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 thesamefreedoms thatyou received.You mustmake surethat they,too, receiveorcan
get the source code. And you must show themthese 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 thedevelopers' and authors' protection,the GPL clearlyexplains that thereis no warrantyfor
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 provisionto thosedomains infuture versionsof the GPL,as neededto protectthe freedomof
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 assuresthat patents cannotbe usedto 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.