COPYING
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r131 | GNU GENERAL PUBLIC LICENSE | ||
Version 2, June 1991 | ||||
Copyright (C) 1989, 1991 Free Software Foundation, Inc. 51 Franklin Street, | ||||
Fifth Floor, Boston, MA 02110-1301 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 Lesser 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. | ||||