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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 modifi cations and/or translated into another
language. (Hereinafter, translation is included
without limitation in the term “modifi cation”.) Each
licensee is addressed as “you”.
Activities other than copying, distribution and
modifi cation 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 modifi cations or work under the terms of
Section 1 above, provided that you also meet all of
these conditions:
a) You must cause the modifi ed fi les to carry
prominent notices stating that you changed the
fi les 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 modifi ed 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 provide a warranty) and that
users may redistribute the program under these
conditions, and telling the user how to view a copy
of this License. (Exception: if the Program itself
is interactive but does not normally print such an
announcement, your work based on the Program is
not required to print an announcement.)
These requirements apply to the modifi ed work as
a whole. If identifi able sections of that work are not
derived from the Program, and can be reasonably
considered independent and separate works in
themselves, then this License, and its terms, do
not apply to those sections when you distribute
them as separate works. But when you distribute
the same sections as part of a whole which is a
work based on the Program, the distribution of the
whole must be on the terms of this License, whose
permissions for other licensees extend to the entire
whole, and thus to each and every part regardless
of who wrote it.
Thus, it is not the intent of this section to claim
rights or contest your rights to work written entirely
by you; rather, the intent is to exercise the right
to control the distribution of derivative or collective
works based on the Program.
In addition, mere aggregation of another work
not based on the Program with the Program (or
with a work based on the Program) on a volume of
a storage or distribution medium does not bring the
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 modifi ed 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 refl ect 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 modifi cation follow.