Appendix I: GNU General Public License
Version 2, June 1991
Copyright © 1989, 1991 Free Soware Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-
1307 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 soware are designed to take away your freedom to share and change it. By con-
trast, the GNU General Public License is intended to guarantee your freedom to share and change free
soware–to make sure the soware is free for all its users. This General Public License applies to most of
the Free Soware Foundation’s soware and to any other program whose authors commit to using it.
(Some other Free Soware Foundation soware is covered by the GNU Library General Public License in-
stead.) You can apply it to your programs, too.
When we speak of free soware, 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 soware (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 so-
ware 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 soware, 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 re-
cipients 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 soware, and (2) offer you this license which gives
you legal permission to copy, distribute and/or modify the soware.
Also, for each author’s protection and ours, we want to make certain that everyone understands that
there is no warranty for this free soware. If the soware 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 soware patents. We wish to avoid the danger that
redistributors of a free program will individually obtain patent licenses, in effect making the program pro-
prietary. 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
1. 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.
(Hereinaer, 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 out-
side its scope. The act of running the Program is not restricted, and the output from the Program is cov-
ered 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.
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