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. 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, 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.

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.

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.

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 under the terms of Section 1 above, provided that you also meet all of these conditions: the modified files must carry prominent notices stating that you changed the files and the date of any change; any work that you distribute or publish that contains or is derived from the Program must be licensed as a whole at no charge to all third parties under the terms of this License; and if the modified program normally reads commands interactively when run, you must cause it to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty.

3. You may copy and distribute the Program in object code or executable form under the terms of Sections 1 and 2 above provided that you also accompany it with the complete corresponding machine-readable source code, or with a written offer to give any third party the complete corresponding machine-readable source code.

4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License.

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.

6. Each time you redistribute 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.

7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason, conditions are imposed on you that contradict the conditions of this License, they do not excuse you from the conditions of this License.

8. If the distribution and/or use of the Program is restricted in certain countries, the original copyright holder may add an explicit geographical distribution limitation excluding those countries.

9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time.

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.

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.

12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER BE LIABLE TO YOU FOR DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM.
