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) <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. | |
"CLASSPATH" EXCEPTION TO THE GPL VERSION 2 | |
Certain source files distributed by Sun Microsystems, Inc. | |
are subject to the following clarification and special | |
exception to the GPL Version 2, but only where Sun has | |
expressly included in the particular source file's header | |
the words "Sun designates this particular file as subject | |
to the "Classpath" exception as provided by Sun in the | |
License file that accompanied this code." | |
Linking this library statically or dynamically with other | |
modules is making a combined work based on this library. | |
Thus, the terms and conditions of the GNU General Public | |
License Version 2 cover the whole combination. | |
As a special exception, the copyright holders of this | |
library give you permission to link this library with | |
independent modules to produce an executable, regardless of | |
the license terms of these independent modules, and to copy | |
and distribute the resulting executable under terms of your | |
choice, provided that you also meet, for each linked | |
independent module, the terms and conditions of the license | |
of that module. An independent module is a module which is | |
not derived from or based on this library. If you modify | |
this library, you may extend this exception to your version | |
of the library, but you are not obligated to do so. If you | |
do not wish to do so, delete this exception statement from | |
your version. |