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GNU GENERAL PUBLIC LICENSE
V ersion 2, June 1991
Copyright © 1989, 1991 Free Software Foundation, Inc., 51 Franklin Str eet, Fifth Floor , Boston, MA 02110-1301 USA
Everyone is per mitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your fr eedom to
share and change it. By contrast, the GNU General Public License is
intended to guarantee your freedom to shar e and change free software—to
make sure the software is fr ee for all its users. This General Public License
applies to most of the Free Softwar e Foundation's software and to any other
program whose authors commit to using it. (Some other Fr ee Software
Foundation software is covered by the GNU Lesser General Public License
instead.) Y ou can apply it to your programs, too.
When we speak of free softwar e, we are referring to freedom, not price. Our
General Public Licenses are designed to make sur e that you have the
freedom to distribute copies of free softwar e (and charge for this service 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 fr ee programs; and that
you know you can do these things.
T o protect your rights, we need to make r estrictions that forbid anyone to
deny you these rights or to ask you to surrender the rights. These
restrictions translate to certain responsibilities for you if you distribute copies
of the software, or if you modify it.
For example, if you distribute copies of such a program, whether gratis or for
a fee, you must give the recipients all the rights that you have. Y ou must
make sure that they , too, receive or can get the sour ce code. And you must
show them these terms so they know their rights.
We protect your rights with two steps: (1) copyright the softwar e, and (2)
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Also, for each author's protection and ours, we want to make certain that
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Finally , any free program is thr eatened constantly by software patents. We
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free use or not licensed at all.
The precise terms and conditions for copying, distribution and modification
follow .
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING,
DISTRIBUTION AND MODIFICA TION
0. This License applies to any program or other work which contains a
notice placed by the copyright holder saying it may be distributed
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verbatim or with modifications and/or translated into another language.
(Hereinafter , translation is included without limitation in the term
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Activities other than copying, distribution and modification are not
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that is true depends on what the Program does.
1. Y ou may copy and distribute verbatim copies of the Program's source
code as you receive it, in any medium, pr ovided that you conspicuously
and appropriately publish on each copy an appr opriate copyright
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Y ou may charge a fee for the physical act of transferring a copy , and
you may at your option offer warranty protection in exchange for a fee.
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These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Pr ogram, and
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Section 2) in object code or executable form under the ter ms of
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4. Y ou may not copy , modify , sublicense, or distribute the Program except
as expressly pr ovided under this License. Any attempt otherwise to
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automatically terminate your rights under this License. However ,
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