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
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.
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 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)
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) year 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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