the gnu general public license.txt

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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