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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)
o er 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
Propiedad intelectual del software
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 modi cation follow.
TERMS AND CONDITIONS
0. De nitions.
"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 "modi ed version" of the earlier work or a work
"based on" the earlier work.
A "covered work" means either the unmodi ed 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 modi cation), making available to the public, and
in some countries other activities as well.
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