| GNU GENERAL PUBLIC LICENSE |
| Version 3, 29 June 2007 |
| |
| Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> |
| Everyone is permitted to copy and distribute verbatim copies |
| of this license document, but changing it is not allowed. |
| |
| Preamble |
| |
| The GNU General Public License is a free, copyleft license for |
| software and other kinds of works. |
| |
| The licenses for most software and other practical works are designed |
| to take away your freedom to share and change the works. By contrast, |
| the GNU General Public License is intended to guarantee your freedom to |
| share and change all versions of a program--to make sure it remains free |
| software for all its users. We, the Free Software Foundation, use the |
| GNU General Public License for most of our software; it applies also to |
| any other work released this way by its authors. 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 |
| them 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 prevent others from denying you |
| these rights or asking you to surrender the rights. Therefore, you have |
| certain responsibilities if you distribute copies of the software, or if |
| you modify it: responsibilities to respect the freedom of others. |
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| For example, if you distribute copies of such a program, whether |
| gratis or for a fee, you must pass on to the recipients the same |
| freedoms that you received. 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. |
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| Developers that use the GNU GPL protect your rights with two steps: |
| (1) assert copyright on the software, and (2) offer you this License |
| giving you legal permission to copy, distribute and/or modify it. |
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| For the developers' and authors' protection, the GPL clearly explains |
| that there is no warranty for this free software. For both users' and |
| authors' sake, the GPL requires that modified versions be marked as |
| changed, so that their problems will not be attributed erroneously to |
| authors of previous versions. |
| |