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156
OPEN SOURCE LICENSE
GNU GENERAL PUBLIC LI-
CENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Founda-
tion, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-
1301, USA
Everyone is permitted to copy and distribute ver-
batim 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 refer-
ring 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 restric-
tions that forbid anyone to deny you these rights or
to ask you to surrender the rights. These restric-
tions 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 individu-
ally 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, DIS-
TRIBUTION AND MODIFICATION
0. This License applies to any program or other
work which contains a notice placed by the copy-
right 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 lan-
guage. (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 hav-
ing been made by running the Program). Whether
that is true depends on what the Program does.
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