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 Library 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.
PSW.book Page 19 Wednesday, February 27, 2013 2:49 PM
Warranty Information 16
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