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OPEN SOURCESOFTWARE LICENSE
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 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.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS
FOR COPYING, DISTRIBUTION
AND
MODIFICATION
O.
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
interactivety
when run, you must cause it, when started
running for such interactive use in the most ordinary
way,
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85
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