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1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title>The GNU General Public License (GPL)</title> 5 </head> 6 <body> 7 <h1>The GNU General Public License (GPL)</h1> 8 <h2>Version 2, June 1991</h2> 9 <p>Copyright (C) 1989, 1991 Free Software Foundation, Inc.<br /> 10 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</p> 11 <p>Everyone is permitted to copy and distribute verbatim copies<br /> 12 of this license document, but changing it is not allowed.</p> 13 14 <p><strong>Preamble</strong></p> 15 <p>The licenses for most software are designed to take away your freedom to share 16 and change it. By contrast, the GNU General Public License is intended to guarantee 17 your freedom to share and change free software--to make sure the software is 18 free for all its users. This General Public License applies to most of the 19 Free Software Foundation's software and to any other program whose authors 20 commit to using it. (Some other Free Software Foundation software is covered 21 by the GNU Library General Public License instead.) You can apply it to your 22 programs, too.</p> 23 <p>When we speak of free software, we are referring to freedom, not price. Our 24 General Public Licenses are designed to make sure that you have the freedom 25 to distribute copies of free software (and charge for this service if you wish), 26 that you receive source code or can get it if you want it, that you can change 27 the software or use pieces of it in new free programs; and that you know you 28 can do these things.</p> 29 <p>To protect your rights, we need to make restrictions that forbid anyone to 30 deny you these rights or to ask you to surrender the rights. These restrictions 31 translate to certain responsibilities for you if you distribute copies of the 32 software, or if you modify it.</p> 33 <p>For example, if you distribute copies of such a program, whether gratis or 34 for a fee, you must give the recipients all the rights that you have. You must 35 make sure that they, too, receive or can get the source code. And you must 36 show them these terms so they know their rights.</p> 37 <p>We protect your rights with two steps: (1) copyright the software, and (2) 38 offer you this license which gives you legal permission to copy, distribute 39 and/or modify the software.</p> 40 <p>Also, for each author's protection and ours, we want to make certain that 41 everyone understands that there is no warranty for this free software. If the 42 software is modified by someone else and passed on, we want its recipients 43 to know that what they have is not the original, so that any problems introduced 44 by others will not reflect on the original authors' reputations.</p> 45 <p>Finally, any free program is threatened constantly by software patents. We 46 wish to avoid the danger that redistributors of a free program will individually 47 obtain patent licenses, in effect making the program proprietary. To prevent 48 this, we have made it clear that any patent must be licensed for everyone's 49 free use or not licensed at all.</p> 50 <p>The precise terms and conditions for copying, distribution and modification 51 follow.</p> 52 53 <p><strong>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</strong></p> 54 <p><strong>0</strong>. This License applies to any program or other work which 55 contains a notice placed by the copyright holder saying it may be distributed 56 under the terms of this General Public License. The "Program", below, refers 57 to any such program or work, and a "work based on the Program" means either 58 the Program or any derivative work under copyright law: that is to say, a work 59 containing the Program or a portion of it, either verbatim or with modifications 60 and/or translated into another language. (Hereinafter, translation is included 61 without limitation in the term "modification".) Each licensee is addressed 62 as "you".</p> 63 <p>Activities other than copying, distribution and modification are not covered 64 by this License; they are outside its scope. The act of running the Program 65 is not restricted, and the output from the Program is covered only if its contents 66 constitute a work based on the Program (independent of having been made by 67 running the Program). Whether that is true depends on what the Program does.</p> 68 <p><strong>1</strong>. You may copy and distribute verbatim copies of the Program's 69 source code as you receive it, in any medium, provided that you conspicuously 70 and appropriately publish on each copy an appropriate copyright notice and 71 disclaimer of warranty; keep intact all the notices that refer to this License 72 and to the absence of any warranty; and give any other recipients of the Program 73 a copy of this License along with the Program.</p> 74 <p>You may charge a fee for the physical act of transferring a copy, and you 75 may at your option offer warranty protection in exchange for a fee.</p> 76 <p><strong>2</strong>. You may modify your copy or copies of the Program or any 77 portion of it, thus forming a work based on the Program, and copy and distribute 78 such modifications or work under the terms of Section 1 above, provided that 79 you also meet all of these conditions:</p> 80 <blockquote> 81 <p>a) You must cause the modified files to carry prominent notices stating 82 that you changed the files and the date of any change.</p> 83 <p>b) You must cause any work that you distribute or publish, that in whole 84 or in part contains or is derived from the Program or any part thereof, to 85 be licensed as a whole at no charge to all third parties under the terms 86 of this License.</p> 87 <p>c) If the modified program normally reads commands interactively when run, 88 you must cause it, when started running for such interactive use in the most 89 ordinary way, to print or display an announcement including an appropriate 90 copyright notice and a notice that there is no warranty (or else, saying 91 that you provide a warranty) and that users may redistribute the program 92 under these conditions, and telling the user how to view a copy of this License. 93 (Exception: if the Program itself is interactive but does not normally print 94 such an announcement, your work based on the Program is not required to print 95 an announcement.)</p> 96 </blockquote> 97 <p>These requirements apply to the modified work as a whole. If identifiable 98 sections of that work are not derived from the Program, and can be reasonably 99 considered independent and separate works in themselves, then this License, 100 and its terms, do not apply to those sections when you distribute them as separate 101 works. But when you distribute the same sections as part of a whole which is 102 a work based on the Program, the distribution of the whole must be on the terms 103 of this License, whose permissions for other licensees extend to the entire 104 whole, and thus to each and every part regardless of who wrote it.</p> 105 <p>Thus, it is not the intent of this section to claim rights or contest your 106 rights to work written entirely by you; rather, the intent is to exercise the 107 right to control the distribution of derivative or collective works based on 108 the Program.</p> 109 <p>In addition, mere aggregation of another work not based on the Program with 110 the Program (or with a work based on the Program) on a volume of a storage 111 or distribution medium does not bring the other work under the scope of this 112 License.</p> 113 <p><strong>3</strong>. You may copy and distribute the Program (or a work based 114 on it, under Section 2) in object code or executable form under the terms of 115 Sections 1 and 2 above provided that you also do one of the following:</p> 116 <blockquote> 117 <p>a) Accompany it with the complete corresponding machine-readable source 118 code, which must be distributed under the terms of Sections 1 and 2 above 119 on a medium customarily used for software interchange; or,</p> 120 <p>b) Accompany it with a written offer, valid for at least three years, to 121 give any third party, for a charge no more than your cost of physically performing 122 source distribution, a complete machine-readable copy of the corresponding 123 source code, to be distributed under the terms of Sections 1 and 2 above 124 on a medium customarily used for software interchange; or,</p> 125 <p>c) Accompany it with the information you received as to the offer to distribute 126 corresponding source code. (This alternative is allowed only for noncommercial 127 distribution and only if you received the program in object code or executable 128 form with such an offer, in accord with Subsection b above.)</p> 129 </blockquote> 130 <p>The source code for a work means the preferred form of the work for making 131 modifications to it. For an executable work, complete source code means all 132 the source code for all modules it contains, plus any associated interface 133 definition files, plus the scripts used to control compilation and installation 134 of the executable. However, as a special exception, the source code distributed 135 need not include anything that is normally distributed (in either source or 136 binary form) with the major components (compiler, kernel, and so on) of the 137 operating system on which the executable runs, unless that component itself 138 accompanies the executable.</p> 139 <p>If distribution of executable or object code is made by offering access to 140 copy from a designated place, then offering equivalent access to copy the source 141 code from the same place counts as distribution of the source code, even though 142 third parties are not compelled to copy the source along with the object code.</p> 143 <p><strong>4</strong>. You may not copy, modify, sublicense, or distribute the 144 Program except as expressly provided under this License. Any attempt otherwise 145 to copy, modify, sublicense or distribute the Program is void, and will automatically 146 terminate your rights under this License. However, parties who have received 147 copies, or rights, from you under this License will not have their licenses 148 terminated so long as such parties remain in full compliance.</p> 149 <p><strong>5</strong>. You are not required to accept this License, since you 150 have not signed it. However, nothing else grants you permission to modify or 151 distribute the Program or its derivative works. These actions are prohibited 152 by law if you do not accept this License. Therefore, by modifying or distributing 153 the Program (or any work based on the Program), you indicate your acceptance 154 of this License to do so, and all its terms and conditions for copying, distributing 155 or modifying the Program or works based on it.</p> 156 <p><strong>6</strong>. Each time you redistribute the Program (or any work based 157 on the Program), the recipient automatically receives a license from the original 158 licensor to copy, distribute or modify the Program subject to these terms and 159 conditions. You may not impose any further restrictions on the recipients' 160 exercise of the rights granted herein. You are not responsible for enforcing 161 compliance by third parties to this License.</p> 162 <p><strong>7</strong>. If, as a consequence of a court judgment or allegation 163 of patent infringement or for any other reason (not limited to patent issues), 164 conditions are imposed on you (whether by court order, agreement or otherwise) 165 that contradict the conditions of this License, they do not excuse you from 166 the conditions of this License. If you cannot distribute so as to satisfy simultaneously 167 your obligations under this License and any other pertinent obligations, then 168 as a consequence you may not distribute the Program at all. For example, if 169 a patent license would not permit royalty-free redistribution of the Program 170 by all those who receive copies directly or indirectly through you, then the 171 only way you could satisfy both it and this License would be to refrain entirely 172 from distribution of the Program.</p> 173 <p>If any portion of this section is held invalid or unenforceable under any 174 particular circumstance, the balance of the section is intended to apply and 175 the section as a whole is intended to apply in other circumstances.</p> 176 <p>It is not the purpose of this section to induce you to infringe any patents 177 or other property right claims or to contest validity of any such claims; this 178 section has the sole purpose of protecting the integrity of the free software 179 distribution system, which is implemented by public license practices. Many 180 people have made generous contributions to the wide range of software distributed 181 through that system in reliance on consistent application of that system; it 182 is up to the author/donor to decide if he or she is willing to distribute software 183 through any other system and a licensee cannot impose that choice.</p> 184 <p>This section is intended to make thoroughly clear what is believed to be a 185 consequence of the rest of this License.</p> 186 <p><strong>8</strong>. If the distribution and/or use of the Program is restricted 187 in certain countries either by patents or by copyrighted interfaces, the original 188 copyright holder who places the Program under this License may add an explicit 189 geographical distribution limitation excluding those countries, so that distribution 190 is permitted only in or among countries not thus excluded. In such case, this 191 License incorporates the limitation as if written in the body of this License.</p> 192 <p><strong>9</strong>. The Free Software Foundation may publish revised and/or 193 new versions of the General Public License from time to time. Such new versions 194 will be similar in spirit to the present version, but may differ in detail 195 to address new problems or concerns.</p> 196 <p>Each version is given a distinguishing version number. If the Program specifies 197 a version number of this License which applies to it and "any later version", 198 you have the option of following the terms and conditions either of that version 199 or of any later version published by the Free Software Foundation. If the Program 200 does not specify a version number of this License, you may choose any version 201 ever published by the Free Software Foundation.</p> 202 <p><strong>10</strong>. If you wish to incorporate parts of the Program into 203 other free programs whose distribution conditions are different, write to the 204 author to ask for permission. For software which is copyrighted by the Free 205 Software Foundation, write to the Free Software Foundation; we sometimes make 206 exceptions for this. Our decision will be guided by the two goals of preserving 207 the free status of all derivatives of our free software and of promoting the 208 sharing and reuse of software generally.</p> 209 <p><strong>NO WARRANTY</strong></p> 210 <p><strong>11</strong>. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE 211 IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. 212 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER 213 PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 214 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 215 AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND 216 PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, 217 YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.</p> 218 <p><strong>12</strong>. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED 219 TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY 220 AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 221 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 222 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO 223 LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR 224 THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 225 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 226 DAMAGES.</p> 227 <p>END OF TERMS AND CONDITIONS</p> 228 </body> 229 </html>
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