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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.
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.
1. You may copy and distribute verbatim copies of
the Program's source code as you receive it, in any
medium, provided that you conspicuously and
appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep
intact all the notices that refer to this License and to
the absence of any warranty; and give any other
recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of
transferring a copy, and you may at your option offer
warranty protection in exchange for a fee.
2. You may modify your copy or copies of the
Program or any portion of it, thus forming a work
based on the Program, and copy and distribute such
modifications or work under the terms of Section 1
above, provided that you also meet all of these
conditions:
a. You must cause the modified files to carry
prominent notices stating that you changed the
files and the date of any change.
b. You must cause any work that you distribute or
publish, that in whole or in part contains or is
derived from the Program or any part thereof, to
be licensed as a whole at no charge to all third
parties under the terms of this License.
c. If the modified program normally reads
commands interactively when run, you must
cause it, when started running for such
interactive use in the most ordinary way, to print
or display an announcement including an
appropriate copyright notice and a notice that
there is no warranty (or else, saying that you
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