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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