| 1 | GNU GENERAL PUBLIC LICENSE
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| 2 | Version 2, June 1991
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| 3 |
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| 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
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| 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 6 | Everyone is permitted to copy and distribute verbatim copies
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| 7 | of this license document, but changing it is not allowed.
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| 8 |
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| 9 | Preamble
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| 10 |
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| 11 | The licenses for most software are designed to take away your
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| 12 | freedom to share and change it. By contrast, the GNU General Public
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| 13 | License is intended to guarantee your freedom to share and change free
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| 14 | software--to make sure the software is free for all its users. This
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| 15 | General Public License applies to most of the Free Software
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| 16 | Foundation's software and to any other program whose authors commit to
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| 17 | using it. (Some other Free Software Foundation software is covered by
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| 18 | the GNU Lesser General Public License instead.) You can apply it to
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| 19 | your programs, too.
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| 20 |
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| 21 | When we speak of free software, we are referring to freedom, not
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| 22 | price. Our General Public Licenses are designed to make sure that you
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| 23 | have the freedom to distribute copies of free software (and charge for
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| 24 | this service if you wish), that you receive source code or can get it
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| 25 | if you want it, that you can change the software or use pieces of it
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| 26 | in new free programs; and that you know you can do these things.
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| 27 |
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| 28 | To protect your rights, we need to make restrictions that forbid
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