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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
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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.
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 there of, 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 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 modified work as a whole.
If identifiable 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 other work under the scope of
this License.
3. You may copy and distribute the Program (or a work
based on it, under Section 2) in object code or executable
form under the terms of Sections 1 and 2 above provided
that you also do one of the following:
a) Accompany it with the complete corresponding
machine-readable source code, which must be
distributed under the terms of Sections 1 and 2 above
on a medium customarily used for software
interchange; or,
b) Accompany it with a written offer, valid for at least
three years, to give any third party, for a charge no
more than your cost of physically performing source
distribution, a complete machine-readable copy of the
corresponding source code, to be distributed under
the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,
c) Accompany it with the information you received as to
the offer to distribute corresponding source code.
(This alternative is allowed only for noncommercial
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accord with Subsection b above.)
The source code for a work means the preferred form of
the work for making modifications to it. For an executable
work, complete source code means all the source code for
all modules it contains, plus any associated interface
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