| [10] | 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 | 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 Library 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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| 29 | anyone to deny you these rights or to ask you to surrender the rights.
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| 30 | These restrictions translate to certain responsibilities for you if you
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| 31 | distribute copies of the software, or if you modify it.
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| 32 |
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| 33 | For example, if you distribute copies of such a program, whether
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| 34 | gratis or for a fee, you must give the recipients all the rights that
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| 35 | you have. You must make sure that they, too, receive or can get the
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| 36 | source code. And you must show them these terms so they know their
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| 37 | rights.
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| 38 |
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| 39 | We protect your rights with two steps: (1) copyright the software, and
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| 40 | (2) offer you this license which gives you legal permission to copy,
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| 41 | distribute and/or modify the software.
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| 42 |
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| 43 | Also, for each author's protection and ours, we want to make certain
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| 44 | that everyone understands that there is no warranty for this free
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| 45 | software. If the software is modified by someone else and passed on, we
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| 46 | want its recipients to know that what they have is not the original, so
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| 47 | that any problems introduced by others will not reflect on the original
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| 48 | authors' reputations.
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| 49 |
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| 50 | Finally, any free program is threatened constantly by software
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| 51 | patents. We wish to avoid the danger that redistributors of a free
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| 52 | program will individually obtain patent licenses, in effect making the
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| 53 | program proprietary. To prevent this, we have made it clear that any
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| 54 | patent must be licensed for everyone's free use or not licensed at all.
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| 55 |
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| 56 | The precise terms and conditions for copying, distribution and
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| 57 | modification follow.
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| 58 | |
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| 59 |
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| 60 | GNU GENERAL PUBLIC LICENSE
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| 61 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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| 62 |
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| 63 | 0. This License applies to any program or other work which contains
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| 64 | a notice placed by the copyright holder saying it may be distributed
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| 65 | under the terms of this General Public License. The "Program", below,
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| 66 | refers to any such program or work, and a "work based on the Program"
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| 67 | means either the Program or any derivative work under copyright law:
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| 68 | that is to say, a work containing the Program or a portion of it,
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| 69 | either verbatim or with modifications and/or translated into another
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| 70 | language. (Hereinafter, translation is included without limitation in
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| 71 | the term "modification".) Each licensee is addressed as "you".
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| 72 |
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| 73 | Activities other than copying, distribution and modification are not
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| 74 | covered by this License; they are outside its scope. The act of
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| 75 | running the Program is not restricted, and the output from the Program
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| 76 | is covered only if its contents constitute a work based on the
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| 77 | Program (independent of having been made by running the Program).
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| 78 | Whether that is true depends on what the Program does.
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| 79 |
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| 80 | 1. You may copy and distribute verbatim copies of the Program's
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| 81 | source code as you receive it, in any medium, provided that you
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| 82 | conspicuously and appropriately publish on each copy an appropriate
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| 83 | copyright notice and disclaimer of warranty; keep intact all the
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| 84 | notices that refer to this License and to the absence of any warranty;
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| 85 | and give any other recipients of the Program a copy of this License
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| 86 | along with the Program.
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| 87 |
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| 88 | You may charge a fee for the physical act of transferring a copy, and
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| 89 | you may at your option offer warranty protection in exchange for a fee.
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| 90 |
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| 91 | 2. You may modify your copy or copies of the Program or any portion
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| 92 | of it, thus forming a work based on the Program, and copy and
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| 93 | distribute such modifications or work under the terms of Section 1
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| 94 | above, provided that you also meet all of these conditions:
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| 95 |
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| 96 | a) You must cause the modified files to carry prominent notices
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| 97 | stating that you changed the files and the date of any change.
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| 98 |
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| 99 | b) You must cause any work that you distribute or publish, that in
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| 100 | whole or in part contains or is derived from the Program or any
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| 101 | part thereof, to be licensed as a whole at no charge to all third
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| 102 | parties under the terms of this License.
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| 103 |
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| 104 | c) If the modified program normally reads commands interactively
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| 105 | when run, you must cause it, when started running for such
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| 106 | interactive use in the most ordinary way, to print or display an
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| 107 | announcement including an appropriate copyright notice and a
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| 108 | notice that there is no warranty (or else, saying that you provide
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| 109 | a warranty) and that users may redistribute the program under
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