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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software
Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA
Everyone is permitted 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 freedom to share and
change it. By contrast, the GNU General
Public License is intended to guarantee your
freedom to share and change free software-
-to make sure the software is free for all its
users. This General Public License applies
to most of the Free Software Foundation’s
software and to any other program whose
authors commit to using it. (Some other Free
Software Foundation software is covered
by the GNU Lesser General Public License
instead.) 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 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 free programs; and that you know you
can do these things.
To protect your rights, we need to make
restrictions 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. 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.
We protect your rights with two steps: (1)
copyright the software, and (2) offer you this
license which gives you legal permission to
copy, distribute and/or modify the software.
Also, for each author’s protection and ours,
we want to make certain that everyone
understands that there is no warranty for this
free software. If the software is modified by
someone else and passed on, we want its
recipients to know that what they have is not
the original, so that any problems introduced
by others will not reflect on the original
authors’ reputations.
Finally, any free program is threatened
constantly by software patents. We wish
to avoid the danger that redistributors of a
free program will individually obtain patent
licenses, in effect making the program
proprietary. To prevent this, we have made
it clear that any patent must be licensed for
everyone’s free use or not licensed at all.
The precise terms and conditions for
copying, distribution and modification follow.
TERMS AND CONDITIONS FOR COPYING,
DISTRIBUTION AND MODIFICATION
0. This License applies to any program or
other work which contains a notice placed
by the copyright holder saying it may be
distributed under the terms of this General
Public License. The “Program”, below,
refers to any such program or work, and
a “work based on the Program” means
either the Program or any derivative work
under copyright law: that is to say, a work
containing the Program or a portion of it,
either verbatim or with modifications and/or
translated into another language. (Hereinafter,
translation is included without limitation in
the term “modification”.) Each licensee is
addressed as “you”.
Activities other than copying, distribution
and modification are not covered by this
License; they are outside its scope. The act
of running the Program is not restricted, and
the output from the Program is covered only
if its contents constitute a work based on the
Program (independent of having been made
by running the Program). Whether that is true
depends on what the Program does.
1. You may copy and distribute verbatim
copies of the Program’s source code as you
receive it, in any medium, provided that you
conspicuously and appropriately publish on
each copy an appropriate copyright notice
and disclaimer of warranty; keep intact all
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