| 1 | GNU GENERAL PUBLIC LICENSE | 
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| 2 |  | 
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| 3 | Version 2, June 1991 | 
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| 4 |  | 
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| 5 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 Temple Place - Suite | 
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| 6 | 330, Boston, MA  02111-1307, USA | 
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| 7 |  | 
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| 8 | Everyone is permitted to copy and distribute verbatim copies of this license | 
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| 9 | document, but changing it is not allowed. | 
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| 10 |  | 
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| 11 | Preamble | 
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| 12 |  | 
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| 13 | The licenses for most software are designed to take away your freedom to share | 
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| 14 | and change it. By contrast, the GNU General Public License is intended to | 
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| 15 | guarantee your freedom to share and change free software--to make sure the | 
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| 16 | software is free for all its users. This General Public License applies to most | 
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| 17 | of the Free Software Foundation's software and to any other program whose | 
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| 18 | authors commit to using it. (Some other Free Software Foundation software is | 
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| 19 | covered by the GNU Library General Public License instead.) You can apply it to | 
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| 20 | your programs, too. | 
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| 21 |  | 
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| 22 | When we speak of free software, we are referring to freedom, not price. Our | 
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| 23 | General Public Licenses are designed to make sure that you have the freedom to | 
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| 24 | distribute copies of free software (and charge for this service if you wish), | 
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| 25 | that you receive source code or can get it if you want it, that you can change | 
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| 26 | the software or use pieces of it in new free programs; and that you know you | 
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| 27 | can do these things. | 
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| 28 |  | 
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| 29 | To protect your rights, we need to make restrictions that forbid anyone to deny | 
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| 30 | you these rights or to ask you to surrender the rights. These restrictions | 
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| 31 | translate to certain responsibilities for you if you distribute copies of the | 
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| 32 | software, or if you modify it. | 
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| 33 |  | 
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| 34 | For example, if you distribute copies of such a program, whether gratis or for | 
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| 35 | a fee, you must give the recipients all the rights that you have. You must make | 
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| 36 | sure that they, too, receive or can get the source code. And you must show them | 
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| 37 | these terms so they know their rights. | 
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| 38 |  | 
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| 39 | We protect your rights with two steps: (1) copyright the software, and (2) | 
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| 40 | offer you this license which gives you legal permission to copy, distribute | 
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| 41 | 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 that | 
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| 44 | everyone understands that there is no warranty for this free software. If the | 
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| 45 | software is modified by someone else and passed on, we want its recipients to | 
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| 46 | know that what they have is not the original, so that any problems introduced | 
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| 47 | by others will not reflect on the original authors' reputations. | 
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| 48 |  | 
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| 49 | Finally, any free program is threatened constantly by software patents. We wish | 
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| 50 | to avoid the danger that redistributors of a free program will individually | 
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| 51 | obtain patent licenses, in effect making the program proprietary. To prevent | 
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| 52 | this, we have made it clear that any patent must be licensed for everyone's | 
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| 53 | free use or not licensed at all. | 
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| 54 |  | 
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| 55 | The precise terms and conditions for copying, distribution and modification | 
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| 56 | follow. | 
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| 57 |  | 
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| 58 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | 
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| 59 |  | 
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| 60 | 0. This License applies to any program or other work which contains a notice | 
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| 61 | placed by the copyright holder saying it may be distributed under the terms of | 
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| 62 | this General Public License. The "Program", below, refers to any such program | 
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| 63 | or work, and a "work based on the Program" means either the Program or any | 
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| 64 | derivative work under copyright law: that is to say, a work containing the | 
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| 65 | Program or a portion of it, either verbatim or with modifications and/or | 
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| 66 | translated into another language. (Hereinafter, translation is included without | 
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| 67 | limitation in the term "modification".) Each licensee is addressed as "you". | 
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| 68 |  | 
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| 69 | Activities other than copying, distribution and modification are not covered by | 
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| 70 | this License; they are outside its scope. The act of running the Program is not | 
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| 71 | restricted, and the output from the Program is covered only if its contents | 
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| 72 | constitute a work based on the Program (independent of having been made by | 
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| 73 | running the Program). Whether that is true depends on what the Program does. | 
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| 74 |  | 
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| 75 | 1. You may copy and distribute verbatim copies of the Program's source code as | 
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| 76 | you receive it, in any medium, provided that you conspicuously and | 
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| 77 | appropriately publish on each copy an appropriate copyright notice and | 
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| 78 | disclaimer of warranty; keep intact all the notices that refer to this License | 
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| 79 | and to the absence of any warranty; and give any other recipients of the | 
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| 80 | Program a copy of this License along with the Program. | 
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| 81 |  | 
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| 82 | You may charge a fee for the physical act of transferring a copy, and you may | 
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| 83 | at your option offer warranty protection in exchange for a fee. | 
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| 84 |  | 
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| 85 | 2. You may modify your copy or copies of the Program or any portion of it, thus | 
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| 86 | forming a work based on the Program, and copy and distribute such modifications | 
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| 87 | or work under the terms of Section 1 above, provided that you also meet all of | 
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| 88 | these conditions: | 
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| 89 |  | 
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| 90 | a) You must cause the modified files to carry prominent notices stating | 
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| 91 | that you changed the files and the date of any change. | 
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| 92 |  | 
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| 93 | b) You must cause any work that you distribute or publish, that in whole or | 
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| 94 | in part contains or is derived from the Program or any part thereof, to be | 
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| 95 | licensed as a whole at no charge to all third parties under the terms of this | 
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| 96 | License. | 
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| 97 |  | 
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| 98 | c) If the modified program normally reads commands interactively when run, | 
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| 99 | you must cause it, when started running for such interactive use in the most | 
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| 100 | ordinary way, to print or display an announcement including an appropriate | 
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| 101 | copyright notice and a notice that there is no warranty (or else, saying that | 
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| 102 | you provide a warranty) and that users may redistribute the program under these | 
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| 103 | conditions, and telling the user how to view a copy of this License. | 
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| 104 | (Exception: if the Program itself is interactive but does not normally print | 
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| 105 | such an announcement, your work based on the Program is not required to print | 
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| 106 | an announcement.) | 
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| 107 |  | 
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| 108 | These requirements apply to the modified work as a whole. If identifiable | 
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| 109 | sections of that work are not derived from the Program, and can be reasonably | 
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| 110 | considered independent and separate works in themselves, then this License, and | 
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| 111 | its terms, do not apply to those sections when you distribute them as separate | 
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| 112 | works. But when you distribute the same sections as part of a whole which is a | 
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| 113 | work based on the Program, the distribution of the whole must be on the terms | 
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| 114 | of this License, whose permissions for other licensees extend to the entire | 
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| 115 | whole, and thus to each and every part regardless of who wrote it. | 
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| 116 |  | 
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| 117 | Thus, it is not the intent of this section to claim rights or contest your | 
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| 118 | rights to work written entirely by you; rather, the intent is to exercise the | 
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| 119 | right to control the distribution of derivative or collective works based on | 
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| 120 | the Program. | 
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| 121 |  | 
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| 122 | In addition, mere aggregation of another work not based on the Program with the | 
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| 123 | Program (or with a work based on the Program) on a volume of a storage or | 
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| 124 | distribution medium does not bring the other work under the scope of this | 
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| 125 | License. | 
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| 126 |  | 
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| 127 | 3. You may copy and distribute the Program (or a work based on it, under | 
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| 128 | Section 2) in object code or executable form under the terms of Sections 1 and | 
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| 129 | 2 above provided that you also do one of the following: | 
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| 130 |  | 
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| 131 | a) Accompany it with the complete corresponding machine-readable source | 
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| 132 | code, which must be distributed under the terms of Sections 1 and 2 above on a | 
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| 133 | medium customarily used for software interchange; or, | 
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| 134 |  | 
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| 135 | b) Accompany it with a written offer, valid for at least three years, to | 
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| 136 | give any third party, for a charge no more than your cost of physically | 
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| 137 | performing source distribution, a complete machine-readable copy of the | 
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| 138 | corresponding source code, to be distributed under the terms of Sections 1 and | 
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| 139 | 2 above on a medium customarily used for software interchange; or, | 
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| 140 |  | 
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| 141 | c) Accompany it with the information you received as to the offer to | 
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| 142 | distribute corresponding source code. (This alternative is allowed only for | 
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| 143 | noncommercial distribution and only if you received the program in object code | 
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| 144 | or executable form with such an offer, in accord with Subsection b above.) | 
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| 145 |  | 
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| 146 | The source code for a work means the preferred form of the work for making | 
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| 147 | modifications to it. For an executable work, complete source code means all the | 
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| 148 | source code for all modules it contains, plus any associated interface | 
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| 149 | definition files, plus the scripts used to control compilation and installation | 
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| 150 | of the executable. However, as a special exception, the source code distributed | 
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| 151 | need not include anything that is normally distributed (in either source or | 
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| 152 | binary form) with the major components (compiler, kernel, and so on) of the | 
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| 153 | operating system on which the executable runs, unless that component itself | 
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| 154 | accompanies the executable. | 
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| 155 |  | 
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| 156 | If distribution of executable or object code is made by offering access to copy | 
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| 157 | from a designated place, then offering equivalent access to copy the source | 
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| 158 | code from the same place counts as distribution of the source code, even though | 
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| 159 | third parties are not compelled to copy the source along with the object code. | 
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| 160 |  | 
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| 161 | 4. You may not copy, modify, sublicense, or distribute the Program except as | 
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| 162 | expressly provided under this License. Any attempt otherwise to copy, modify, | 
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| 163 | sublicense or distribute the Program is void, and will automatically terminate | 
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| 164 | your rights under this License. However, parties who have received copies, or | 
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| 165 | rights, from you under this License will not have their licenses terminated so | 
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| 166 | long as such parties remain in full compliance. | 
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| 167 |  | 
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| 168 | 5. You are not required to accept this License, since you have not signed it. | 
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| 169 | However, nothing else grants you permission to modify or distribute the Program | 
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| 170 | or its derivative works. These actions are prohibited by law if you do not | 
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| 171 | accept this License. Therefore, by modifying or distributing the Program (or | 
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| 172 | any work based on the Program), you indicate your acceptance of this License to | 
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| 173 | do so, and all its terms and conditions for copying, distributing or modifying | 
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| 174 | the Program or works based on it. | 
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| 175 |  | 
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| 176 | 6. Each time you redistribute the Program (or any work based on the Program), | 
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| 177 | the recipient automatically receives a license from the original licensor to | 
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| 178 | copy, distribute or modify the Program subject to these terms and conditions. | 
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| 179 | You may not impose any further restrictions on the recipients' exercise of the | 
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| 180 | rights granted herein. You are not responsible for enforcing compliance by | 
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| 181 | third parties to this License. | 
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| 182 |  | 
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| 183 | 7. If, as a consequence of a court judgment or allegation of patent | 
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| 184 | infringement or for any other reason (not limited to patent issues), conditions | 
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| 185 | are imposed on you (whether by court order, agreement or otherwise) that | 
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| 186 | contradict the conditions of this License, they do not excuse you from the | 
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| 187 | conditions of this License. If you cannot distribute so as to satisfy | 
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| 188 | simultaneously your obligations under this License and any other pertinent | 
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| 189 | obligations, then as a consequence you may not distribute the Program at all. | 
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| 190 | For example, if a patent license would not permit royalty-free redistribution | 
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| 191 | of the Program by all those who receive copies directly or indirectly through | 
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| 192 | you, then the only way you could satisfy both it and this License would be to | 
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| 193 | refrain entirely from distribution of the Program. | 
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| 194 |  | 
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| 195 | If any portion of this section is held invalid or unenforceable under any | 
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| 196 | particular circumstance, the balance of the section is intended to apply and | 
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| 197 | the section as a whole is intended to apply in other circumstances. | 
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| 198 |  | 
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| 199 | It is not the purpose of this section to induce you to infringe any patents or | 
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| 200 | other property right claims or to contest validity of any such claims; this | 
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| 201 | section has the sole purpose of protecting the integrity of the free software | 
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| 202 | distribution system, which is implemented by public license practices. Many | 
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| 203 | people have made generous contributions to the wide range of software | 
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| 204 | distributed through that system in reliance on consistent application of that | 
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| 205 | system; it is up to the author/donor to decide if he or she is willing to | 
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| 206 | distribute software through any other system and a licensee cannot impose that | 
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| 207 | choice. | 
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| 208 |  | 
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| 209 | This section is intended to make thoroughly clear what is believed to be a | 
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| 210 | consequence of the rest of this License. | 
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| 211 |  | 
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| 212 | 8. If the distribution and/or use of the Program is restricted in certain | 
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| 213 | countries either by patents or by copyrighted interfaces, the original | 
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| 214 | copyright holder who places the Program under this License may add an explicit | 
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| 215 | geographical distribution limitation excluding those countries, so that | 
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| 216 | distribution is permitted only in or among countries not thus excluded. In such | 
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| 217 | case, this License incorporates the limitation as if written in the body of | 
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| 218 | this License. | 
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| 219 |  | 
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| 220 | 9. The Free Software Foundation may publish revised and/or new versions of the | 
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| 221 | General Public License from time to time. Such new versions will be similar in | 
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| 222 | spirit to the present version, but may differ in detail to address new problems | 
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| 223 | or concerns. | 
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| 224 |  | 
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| 225 | Each version is given a distinguishing version number. If the Program specifies | 
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| 226 | a version number of this License which applies to it and "any later version", | 
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| 227 | you have the option of following the terms and conditions either of that | 
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| 228 | version or of any later version published by the Free Software Foundation. If | 
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| 229 | the Program does not specify a version number of this License, you may choose | 
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| 230 | any version ever published by the Free Software Foundation. | 
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| 231 |  | 
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| 232 | 10. If you wish to incorporate parts of the Program into other free programs | 
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| 233 | whose distribution conditions are different, write to the author to ask for | 
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| 234 | permission. For software which is copyrighted by the Free Software Foundation, | 
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| 235 | write to the Free Software Foundation; we sometimes make exceptions for this. | 
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| 236 | Our decision will be guided by the two goals of preserving the free status of | 
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| 237 | all derivatives of our free software and of promoting the sharing and reuse of | 
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| 238 | software generally. | 
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| 239 |  | 
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| 240 | NO WARRANTY | 
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| 241 |  | 
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| 242 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR | 
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| 243 | THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE | 
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| 244 | STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE | 
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| 245 | PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, | 
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| 246 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | 
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| 247 | FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND | 
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| 248 | PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU | 
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| 249 | ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. | 
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| 250 |  | 
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| 251 | 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL | 
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| 252 | ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE | 
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| 253 | PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY | 
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| 254 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR | 
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| 255 | INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA | 
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| 256 | BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A | 
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| 257 | FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER | 
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| 258 | OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | 
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