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 | |