1The GNU General Public License, Version 2, June 1991 (GPLv2) 2============================================================ 3 4> Copyright (C) 1989, 1991 Free Software Foundation, Inc. 5> 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 6 7Everyone is permitted to copy and distribute verbatim copies of this license 8document, but changing it is not allowed. 9 10 11Preamble 12-------- 13 14The licenses for most software are designed to take away your freedom to share 15and change it. By contrast, the GNU General Public License is intended to 16guarantee your freedom to share and change free software--to make sure the 17software is free for all its users. This General Public License applies to most 18of the Free Software Foundation's software and to any other program whose 19authors commit to using it. (Some other Free Software Foundation software is 20covered by the GNU Lesser General Public License instead.) You can apply it to 21your programs, too. 22 23When we speak of free software, we are referring to freedom, not price. Our 24General Public Licenses are designed to make sure that you have the freedom to 25distribute copies of free software (and charge for this service if you wish), 26that you receive source code or can get it if you want it, that you can change 27the software or use pieces of it in new free programs; and that you know you can 28do these things. 29 30To protect your rights, we need to make restrictions that forbid anyone to deny 31you these rights or to ask you to surrender the rights. These restrictions 32translate to certain responsibilities for you if you distribute copies of the 33software, or if you modify it. 34 35For example, if you distribute copies of such a program, whether gratis or for a 36fee, you must give the recipients all the rights that you have. You must make 37sure that they, too, receive or can get the source code. And you must show them 38these terms so they know their rights. 39 40We protect your rights with two steps: (1) copyright the software, and (2) offer 41you this license which gives you legal permission to copy, distribute and/or 42modify the software. 43 44Also, for each author's protection and ours, we want to make certain that 45everyone understands that there is no warranty for this free software. If the 46software is modified by someone else and passed on, we want its recipients to 47know that what they have is not the original, so that any problems introduced by 48others will not reflect on the original authors' reputations. 49 50Finally, any free program is threatened constantly by software patents. We wish 51to avoid the danger that redistributors of a free program will individually 52obtain patent licenses, in effect making the program proprietary. To prevent 53this, we have made it clear that any patent must be licensed for everyone's free 54use or not licensed at all. 55 56The precise terms and conditions for copying, distribution and modification 57follow. 58 59 60Terms And Conditions For Copying, Distribution And Modification 61--------------------------------------------------------------- 62 63**0.** This License applies to any program or other work which contains a notice 64placed by the copyright holder saying it may be distributed under the terms of 65this General Public License. The "Program", below, refers to any such program or 66work, and a "work based on the Program" means either the Program or any 67derivative work under copyright law: that is to say, a work containing the 68Program or a portion of it, either verbatim or with modifications and/or 69translated into another language. (Hereinafter, translation is included without 70limitation in the term "modification".) Each licensee is addressed as "you". 71 72Activities other than copying, distribution and modification are not covered by 73this License; they are outside its scope. The act of running the Program is not 74restricted, and the output from the Program is covered only if its contents 75constitute a work based on the Program (independent of having been made by 76running the Program). Whether that is true depends on what the Program does. 77 78**1.** You may copy and distribute verbatim copies of the Program's source code 79as you receive it, in any medium, provided that you conspicuously and 80appropriately publish on each copy an appropriate copyright notice and 81disclaimer of warranty; keep intact all the notices that refer to this License 82and to the absence of any warranty; and give any other recipients of the Program 83a copy of this License along with the Program. 84 85You may charge a fee for the physical act of transferring a copy, and you may at 86your option offer warranty protection in exchange for a fee. 87 88**2.** You may modify your copy or copies of the Program or any portion of it, 89thus forming a work based on the Program, and copy and distribute such 90modifications or work under the terms of Section 1 above, provided that you also 91meet all of these conditions: 92 93* **a)** You must cause the modified files to carry prominent notices stating 94 that you changed the files and the date of any change. 95 96* **b)** You must cause any work that you distribute or publish, that in whole 97 or in part contains or is derived from the Program or any part thereof, to 98 be licensed as a whole at no charge to all third parties under the terms of 99 this License. 100 101* **c)** If the modified program normally reads commands interactively when 102 run, you must cause it, when started running for such interactive use in the 103 most ordinary way, to print or display an announcement including an 104 appropriate copyright notice and a notice that there is no warranty (or 105 else, saying that you provide a warranty) and that users may redistribute 106 the program under these conditions, and telling the user how to view a copy 107 of this License. (Exception: if the Program itself is interactive but does 108 not normally print such an announcement, your work based on the Program is 109 not required to print an announcement.) 110 111These requirements apply to the modified work as a whole. If identifiable 112sections of that work are not derived from the Program, and can be reasonably 113considered independent and separate works in themselves, then this License, and 114its terms, do not apply to those sections when you distribute them as separate 115works. But when you distribute the same sections as part of a whole which is a 116work based on the Program, the distribution of the whole must be on the terms of 117this License, whose permissions for other licensees extend to the entire whole, 118and thus to each and every part regardless of who wrote it. 119 120Thus, it is not the intent of this section to claim rights or contest your 121rights to work written entirely by you; rather, the intent is to exercise the 122right to control the distribution of derivative or collective works based on the 123Program. 124 125In addition, mere aggregation of another work not based on the Program with the 126Program (or with a work based on the Program) on a volume of a storage or 127distribution medium does not bring the other work under the scope of this 128License. 129 130**3.** You may copy and distribute the Program (or a work based on it, under 131Section 2) in object code or executable form under the terms of Sections 1 and 2 132above provided that you also do one of the following: 133 134* **a)** Accompany it with the complete corresponding machine-readable source 135 code, which must be distributed under the terms of Sections 1 and 2 above on 136 a medium customarily used for software interchange; or, 137 138* **b)** Accompany it with a written offer, valid for at least three years, to 139 give any third party, for a charge no more than your cost of physically 140 performing source distribution, a complete machine-readable copy of the 141 corresponding source code, to be distributed under the terms of Sections 1 142 and 2 above on a medium customarily used for software interchange; or, 143 144* **c)** Accompany it with the information you received as to the offer to 145 distribute corresponding source code. (This alternative is allowed only for 146 noncommercial distribution and only if you received the program in object 147 code or executable form with such an offer, in accord with Subsection b 148 above.) 149 150The source code for a work means the preferred form of the work for making 151modifications to it. For an executable work, complete source code means all the 152source code for all modules it contains, plus any associated interface 153definition files, plus the scripts used to control compilation and installation 154of the executable. However, as a special exception, the source code distributed 155need not include anything that is normally distributed (in either source or 156binary form) with the major components (compiler, kernel, and so on) of the 157operating system on which the executable runs, unless that component itself 158accompanies the executable. 159 160If distribution of executable or object code is made by offering access to copy 161from a designated place, then offering equivalent access to copy the source code 162from the same place counts as distribution of the source code, even though third 163parties are not compelled to copy the source along with the object code. 164 165**4.** You may not copy, modify, sublicense, or distribute the Program except as 166expressly provided under this License. Any attempt otherwise to copy, modify, 167sublicense or distribute the Program is void, and will automatically terminate 168your rights under this License. However, parties who have received copies, or 169rights, from you under this License will not have their licenses terminated so 170long as such parties remain in full compliance. 171 172**5.** You are not required to accept this License, since you have not signed 173it. However, nothing else grants you permission to modify or distribute the 174Program or its derivative works. These actions are prohibited by law if you do 175not accept this License. Therefore, by modifying or distributing the Program (or 176any work based on the Program), you indicate your acceptance of this License to 177do so, and all its terms and conditions for copying, distributing or modifying 178the Program or works based on it. 179 180**6.** Each time you redistribute the Program (or any work based on the 181Program), the recipient automatically receives a license from the original 182licensor to copy, distribute or modify the Program subject to these terms and 183conditions. You may not impose any further restrictions on the recipients' 184exercise of the rights granted herein. You are not responsible for enforcing 185compliance by third parties to this License. 186 187**7.** If, as a consequence of a court judgment or allegation of patent 188infringement or for any other reason (not limited to patent issues), conditions 189are imposed on you (whether by court order, agreement or otherwise) that 190contradict the conditions of this License, they do not excuse you from the 191conditions of this License. If you cannot distribute so as to satisfy 192simultaneously your obligations under this License and any other pertinent 193obligations, then as a consequence you may not distribute the Program at all. 194For example, if a patent license would not permit royalty-free redistribution of 195the Program by all those who receive copies directly or indirectly through you, 196then the only way you could satisfy both it and this License would be to refrain 197entirely from distribution of the Program. 198 199If any portion of this section is held invalid or unenforceable under any 200particular circumstance, the balance of the section is intended to apply and the 201section as a whole is intended to apply in other circumstances. 202 203It is not the purpose of this section to induce you to infringe any patents or 204other property right claims or to contest validity of any such claims; this 205section has the sole purpose of protecting the integrity of the free software 206distribution system, which is implemented by public license practices. Many 207people have made generous contributions to the wide range of software 208distributed through that system in reliance on consistent application of that 209system; it is up to the author/donor to decide if he or she is willing to 210distribute software through any other system and a licensee cannot impose that 211choice. 212 213This section is intended to make thoroughly clear what is believed to be a 214consequence of the rest of this License. 215 216**8.** If the distribution and/or use of the Program is restricted in certain 217countries either by patents or by copyrighted interfaces, the original copyright 218holder who places the Program under this License may add an explicit 219geographical distribution limitation excluding those countries, so that 220distribution is permitted only in or among countries not thus excluded. In such 221case, this License incorporates the limitation as if written in the body of this 222License. 223 224**9.** The Free Software Foundation may publish revised and/or new versions of 225the General Public License from time to time. Such new versions will be similar 226in spirit to the present version, but may differ in detail to address new 227problems or concerns. 228 229Each version is given a distinguishing version number. If the Program specifies 230a version number of this License which applies to it and "any later version", 231you have the option of following the terms and conditions either of that version 232or of any later version published by the Free Software Foundation. If the 233Program does not specify a version number of this License, you may choose any 234version ever published by the Free Software Foundation. 235 236**10.** If you wish to incorporate parts of the Program into other free programs 237whose distribution conditions are different, write to the author to ask for 238permission. For software which is copyrighted by the Free Software Foundation, 239write to the Free Software Foundation; we sometimes make exceptions for this. 240Our decision will be guided by the two goals of preserving the free status of 241all derivatives of our free software and of promoting the sharing and reuse of 242software generally. 243 244 245No Warranty 246----------- 247 248**11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR 249THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE 250STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM 251"AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, 252BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 253PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE 254PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 255ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 256 257**12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 258WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE 259THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 260GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR 261INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA 262BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A 263FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER 264OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 265