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46
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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