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 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) <year> <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) 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. |