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47
APPENDIX
Open Source License
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.
GNU GENERAL PUBLIC LICENSE
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.
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