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GNU GENERAL PUBLIC LICENSE
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 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
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 languaje.
(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.)
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 distribution
and only if you received the program in object code or executable form
with such an offer, in 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 definition files,
plus the scripts used to control compilation
and installation of the executable.
However, as a special exception, the source code distributed
need not include anything that is normally distributed
(in either source or binary form) with the major components
(compiler, kernel, and so on) of the operating system
on which the executable runs, unless that component
itself accompanies the executable.
If distribution of executable or object code is made
by offering access to copy from a designated place,
then offering equivalent access to copy the source code
from the same place counts as distribution of the source code,
even though third parties are not compelled
to copy the source along with the object code.
4.
You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.
Any attempt otherwise to copy, modify, sublicense or distribute
the Program is void, and will automatically terminate your rights
under this License. However, parties who have received copies,
or rights, from you under this License will not have their licenses
terminated so long as such parties remain in full compliance.
5.
You are not required to accept this License,
since you have not signed it.
However, nothing else grants you permission to modify or
distribute the Program or its derivative works.
These actions are prohibited by law if you do not accept this License.
Therefore, by modifying or distributing the Program
(or any work based on the Program),
you indicate your acceptance of this License to do so,
and all its terms and conditions for copying,
distributing or modifying the Program or works based on it.
6.
Each time you redistribute the Program
(or any work based on the Program),
the recipient automatically receives
a license from the original licensor to copy,
distribute or modify the Program subject to these terms and conditions.
You may not impose any further restrictions on the recipients'
exercise of the rights granted herein.
You are not responsible for enforcing compliance
by third parties to this License.
7.
If, as a consequence of a court judgment
or allegation of patent infringement
or for any other reason (not limited to patent issues),
conditions are imposed on you
(whether by court order, agreement or otherwise)
that contradict the conditions of this License,
they do not excuse you from the conditions of this License.
If you cannot distribute so as to satisfy simultaneously
your obligations under this License and any other pertinent obligations,
then as a consequence you may not distribute the Program at all.
For example, if a patent license would not permit royalty-free
redistribution of the Program by all those who receive copies directly
or indirectly through you, then the only way you could satisfy both it
and this License would be to refrain entirely
from distribution of the Program.
If any portion of this section is held invalid
or unenforceable under any particular circumstance,
the balance of the section is intended to apply and the section
as a whole is intended to apply in other circumstances.
It is not the purpose of this section to induce you to infringe
any patents or other property right claims or to contest validity
of any such claims; this section has the sole purpose of protecting
the integrity of the free software distribution system,
which is implemented by public license practices.
Many people have made generous contributions to the wide range
of software distributed through that system in reliance
on consistent application of that system;
it is up to the author/donor to decide if he or she is willing
to distribute software through any other system
and a licensee cannot impose that choice.
This section is intended to make thoroughly clear what
is believed to be a consequence of the rest of this License.
8.
If the distribution and/or use of the Program is restricted
in certain countries either by patents or by copyrighted interfaces,
the original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation
excluding those countries, so that distribution is permitted
only in or among countries not thus excluded.
In such case, this License incorporates the limitation
as if written in the body of this License.
9.
The Free Software Foundation may publish revised and/or
new versions of the General Public License from time to time.
Such new versions will be similar in spirit to the present version,
but may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number.
If the Program specifies a version number of this License
which applies to it and "any later version",
you have the option of following the terms and conditions
either of that version or of any later version published
by the Free Software Foundation.
If the Program does not specify a version number of this License,
you may choose any version ever published by the Free Software Foundation.
10.
If you wish to incorporate parts of the Program into
other free programs whose distribution conditions are different,
write to the author to ask for permission.
For software which is copyrighted by the Free Software Foundation,
write to the Free Software Foundation;
we sometimes make exceptions for this.
Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software
and of promoting the sharing and reuse of software generally.
NO WARRANTY
11.
BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE,
THERE IS NO WARRANTY FOR THE PROGRAM,
TO THE EXTENT PERMITTED BY APPLICABLE LAW.
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS
AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.
THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE,
YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
12.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO
IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY
WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE,
BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT
OF THE USE OR INABILITY TO USE THE PROGRAM
(INCLUDING BUT NOT LIMITED TO LOSS OF DATA
OR DATA BEING RENDERED INACCURATE
OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES
OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY
HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program.
It is safest to attach them to the start of each source file
to most effectively convey the exclusion of warranty;
and each file should have at least the "copyright" line
and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 19yy <name of author>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation;
either version 2 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice
like this when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) 19yy name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details.
The hypothetical commands 'show w' and 'show c' should show
the appropriate parts of the General Public License.
Of course, the commands you use may be called something other
than 'show w' and 'show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer)
or your school, if any, to sign a "copyright disclaimer" for the program,
if necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
'Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library,
you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do,
use the GNU Library General Public License instead of this License.
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