I
The
GNU
General
Public
License
(GPL)
Version
2,
June 1991
Copyright (C) 1989,
1991
Free Software Foundation, Inc.
59
Temple Place, Suite 330, Boston, MA 02111-1307 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 Library 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
th
at 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
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 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 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.)
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