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GNU GENERAL PUBLIC LICENSE
Version 2,June 1991
Copyright (C)1989,1991 Free SoftwareFoundation,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 l egal
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 pa t ent 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.
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.
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
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