1GNU GENERAL PUBLIC LICENSE 2Version 2, June 1991 3 4Copyright (C) 1989, 1991 Free Software Foundation, Inc. 551 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 10Preamble 11 12The licenses for most software are designed to take away your freedom to share 13and change it. By contrast, the GNU General Public License is intended to 14guarantee your freedom to share and change free software--to make sure the 15software is free for all its users. This General Public License applies to 16most of the Free Software Foundation's software and to any other program whose 17authors commit to using it. (Some other Free Software Foundation software 18is covered by the GNU Lesser General Public License instead.) You can apply 19it to your programs, too. 20 21When we speak of free software, we are referring to freedom, not price. Our 22General Public Licenses are designed to make sure that you have the freedom 23to distribute copies of free software (and charge for this service if you 24wish), that you receive source code or can get it if you want it, that you 25can change the software or use pieces of it in new free programs; and that 26you know you can do these things. 27 28To protect your rights, we need to make restrictions that forbid anyone to 29deny you these rights or to ask you to surrender the rights. These restrictions 30translate to certain responsibilities for you if you distribute copies of 31the software, or if you modify it. 32 33For example, if you distribute copies of such a program, whether gratis or 34for a fee, you must give the recipients all the rights that you have. You 35must make sure that they, too, receive or can get the source code. And you 36must show them these terms so they know their rights. 37 38We protect your rights with two steps: (1) copyright the software, and (2) 39offer you this license which gives you legal permission to copy, distribute 40and/or modify the software. 41 42Also, for each author's protection and ours, we want to make certain that 43everyone understands that there is no warranty for this free software. If 44the software is modified by someone else and passed on, we want its recipients 45to know that what they have is not the original, so that any problems introduced 46by others will not reflect on the original authors' reputations. 47 48Finally, any free program is threatened constantly by software patents. We 49wish to avoid the danger that redistributors of a free program will individually 50obtain patent licenses, in effect making the program proprietary. To prevent 51this, we have made it clear that any patent must be licensed for everyone's 52free use or not licensed at all. 53 54The precise terms and conditions for copying, distribution and modification 55follow. 56 57TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 58 590. This License applies to any program or other work which contains a notice 60placed by the copyright holder saying it may be distributed under the terms 61of this General Public License. The "Program", below, refers to any such program 62or work, and a "work based on the Program" means either the Program or any 63derivative work under copyright law: that is to say, a work containing the 64Program or a portion of it, either verbatim or with modifications and/or translated 65into another language. (Hereinafter, translation is included without limitation 66in the term "modification".) Each licensee is addressed as "you". 67 68Activities other than copying, distribution and modification are not covered 69by this License; they are outside its scope. The act of running the Program 70is not restricted, and the output from the Program is covered only if its 71contents constitute a work based on the Program (independent of having been 72made by running the Program). Whether that is true depends on what the Program 73does. 74 751. You may copy and distribute verbatim copies of the Program's source code 76as you receive it, in any medium, provided that you conspicuously and appropriately 77publish on each copy an appropriate copyright notice and disclaimer of warranty; 78keep intact all the notices that refer to this License and to the absence 79of any warranty; and give any other recipients of the Program a copy of this 80License along with the Program. 81 82You may charge a fee for the physical act of transferring a copy, and you 83may at your option offer warranty protection in exchange for a fee. 84 852. You may modify your copy or copies of the Program or any portion of it, 86thus forming a work based on the Program, and copy and distribute such modifications 87or work under the terms of Section 1 above, provided that you also meet all 88of these conditions: 89 90a) You must cause the modified files to carry prominent notices stating that 91you changed the files and the date of any change. 92 93b) You must cause any work that you distribute or publish, that in whole or 94in part contains or is derived from the Program or any part thereof, to be 95licensed as a whole at no charge to all third parties under the terms of this 96License. 97 98c) If the modified program normally reads commands interactively when run, 99you must cause it, when started running for such interactive use in the most 100ordinary way, to print or display an announcement including an appropriate 101copyright notice and a notice that there is no warranty (or else, saying that 102you provide a warranty) and that users may redistribute the program under 103these conditions, and telling the user how to view a copy of this License. 104(Exception: if the Program itself is interactive but does not normally print 105such an announcement, your work based on the Program is not required to print 106an announcement.) 107 108These requirements apply to the modified work as a whole. If identifiable 109sections of that work are not derived from the Program, and can be reasonably 110considered independent and separate works in themselves, then this License, 111and its terms, do not apply to those sections when you distribute them as 112separate works. But when you distribute the same sections as part of a whole 113which is a work based on the Program, the distribution of the whole must be 114on the terms of this License, whose permissions for other licensees extend 115to the entire whole, and thus to each and every part regardless of who wrote 116it. 117 118Thus, it is not the intent of this section to claim rights or contest your 119rights to work written entirely by you; rather, the intent is to exercise 120the right to control the distribution of derivative or collective works based 121on the Program. 122 123In addition, mere aggregation of another work not based on the Program with 124the Program (or with a work based on the Program) on a volume of a storage 125or distribution medium does not bring the other work under the scope of this 126License. 127 1283. You may copy and distribute the Program (or a work based on it, under Section 1292) in object code or executable form under the terms of Sections 1 and 2 above 130provided that you also do one of the following: 131 132a) Accompany it with the complete corresponding machine-readable source code, 133which must be distributed under the terms of Sections 1 and 2 above on a medium 134customarily used for software interchange; or, 135 136b) Accompany it with a written offer, valid for at least three years, to give 137any third party, for a charge no more than your cost of physically performing 138source distribution, a complete machine-readable copy of the corresponding 139source code, to be distributed under the terms of Sections 1 and 2 above on 140a medium customarily used for software interchange; or, 141 142c) Accompany it with the information you received as to the offer to distribute 143corresponding source code. (This alternative is allowed only for noncommercial 144distribution and only if you received the program in object code or executable 145form with such an offer, in accord with Subsection b above.) 146 147The source code for a work means the preferred form of the work for making 148modifications to it. For an executable work, complete source code means all 149the source code for all modules it contains, plus any associated interface 150definition files, plus the scripts used to control compilation and installation 151of the executable. However, as a special exception, the source code distributed 152need not include anything that is normally distributed (in either source or 153binary form) with the major components (compiler, kernel, and so on) of the 154operating system on which the executable runs, unless that component itself 155accompanies the executable. 156 157If distribution of executable or object code is made by offering access to 158copy from a designated place, then offering equivalent access to copy the 159source code from the same place counts as distribution of the source code, 160even though third parties are not compelled to copy the source along with 161the object code. 162 1634. You may not copy, modify, sublicense, or distribute the Program except 164as expressly provided under this License. Any attempt otherwise to copy, modify, 165sublicense or distribute the Program is void, and will automatically terminate 166your rights under this License. However, parties who have received copies, 167or rights, from you under this License will not have their licenses terminated 168so long as such parties remain in full compliance. 169 1705. You are not required to accept this License, since you have not signed 171it. However, nothing else grants you permission to modify or distribute the 172Program or its derivative works. These actions are prohibited by law if you 173do not accept this License. Therefore, by modifying or distributing the Program 174(or any work based on the Program), you indicate your acceptance of this License 175to do so, and all its terms and conditions for copying, distributing or modifying 176the Program or works based on it. 177 1786. Each time you redistribute the Program (or any work based on the Program), 179the recipient automatically receives a license from the original licensor 180to copy, distribute or modify the Program subject to these terms and conditions. 181You may not impose any further restrictions on the recipients' exercise of 182the rights granted herein. You are not responsible for enforcing compliance 183by third parties to this License. 184 1857. If, as a consequence of a court judgment or allegation of patent infringement 186or for any other reason (not limited to patent issues), conditions are imposed 187on you (whether by court order, agreement or otherwise) that contradict the 188conditions of this License, they do not excuse you from the conditions of 189this License. If you cannot distribute so as to satisfy simultaneously your 190obligations under this License and any other pertinent obligations, then as 191a consequence you may not distribute the Program at all. For example, if a 192patent license would not permit royalty-free redistribution of the Program 193by all those who receive copies directly or indirectly through you, then the 194only way you could satisfy both it and this License would be to refrain entirely 195from distribution of the Program. 196 197If any portion of this section is held invalid or unenforceable under any 198particular circumstance, the balance of the section is intended to apply and 199the section as a whole is intended to apply in other circumstances. 200 201It is not the purpose of this section to induce you to infringe any patents 202or other property right claims or to contest validity of any such claims; 203this section has the sole purpose of protecting the integrity of the free 204software distribution system, which is implemented by public license practices. 205Many people have made generous contributions to the wide range of software 206distributed through that system in reliance on consistent application of that 207system; it is up to the author/donor to decide if he or she is willing to 208distribute software through any other system and a licensee cannot impose 209that choice. 210 211This section is intended to make thoroughly clear what is believed to be a 212consequence of the rest of this License. 213 2148. If the distribution and/or use of the Program is restricted in certain 215countries either by patents or by copyrighted interfaces, the original copyright 216holder who places the Program under this License may add an explicit geographical 217distribution limitation excluding those countries, so that distribution is 218permitted only in or among countries not thus excluded. In such case, this 219License incorporates the limitation as if written in the body of this License. 220 2219. The Free Software Foundation may publish revised and/or new versions of 222the General Public License from time to time. Such new versions will be similar 223in spirit to the present version, but may differ in detail to address new 224problems or concerns. 225 226Each version is given a distinguishing version number. If the Program specifies 227a version number of this License which applies to it and "any later version", 228you have the option of following the terms and conditions either of that version 229or of any later version published by the Free Software Foundation. If the 230Program does not specify a version number of this License, you may choose 231any version ever published by the Free Software Foundation. 232 23310. If you wish to incorporate parts of the Program into other free programs 234whose distribution conditions are different, write to the author to ask for 235permission. For software which is copyrighted by the Free Software Foundation, 236write to the Free Software Foundation; we sometimes make exceptions for this. 237Our decision will be guided by the two goals of preserving the free status 238of all derivatives of our free software and of promoting the sharing and reuse 239of software generally. 240 241NO WARRANTY 242 24311. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR 244THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE 245STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM 246"AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, 247BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 248FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE 249OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 250THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 251 25212. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 253WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE 254THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 255GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE 256OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA 257OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES 258OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH 259HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 260 261END OF TERMS AND CONDITIONS 262 263How to Apply These Terms to Your New Programs 264 265If you develop a new program, and you want it to be of the greatest possible 266use to the public, the best way to achieve this is to make it free software 267which everyone can redistribute and change under these terms. 268 269To do so, attach the following notices to the program. It is safest to attach 270them to the start of each source file to most effectively convey the exclusion 271of warranty; and each file should have at least the "copyright" line and a 272pointer to where the full notice is found. 273 274one line to give the program's name and an idea of what it does. Copyright 275(C) yyyy name of author 276 277This program is free software; you can redistribute it and/or modify it under 278the terms of the GNU General Public License as published by the Free Software 279Foundation; either version 2 of the License, or (at your option) any later 280version. 281 282This program is distributed in the hope that it will be useful, but WITHOUT 283ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 284FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 285 286You should have received a copy of the GNU General Public License along with 287this program; if not, write to the Free Software Foundation, Inc., 51 Franklin 288Street, Fifth Floor, Boston, MA 02110-1301, USA. Also add information on how 289to contact you by electronic and paper mail. 290 291If the program is interactive, make it output a short notice like this when 292it starts in an interactive mode: 293 294Gnomovision version 69, Copyright (C) year name of author Gnomovision comes 295with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, 296and you are welcome to redistribute it under certain conditions; type `show 297c' for details. 298 299The hypothetical commands `show w' and `show c' should show the appropriate 300parts of the General Public License. Of course, the commands you use may be 301called something other than `show w' and `show c'; they could even be mouse-clicks 302or menu items--whatever suits your program. 303 304You should also get your employer (if you work as a programmer) or your school, 305if any, to sign a "copyright disclaimer" for the program, if necessary. Here 306is a sample; alter the names: 307 308Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' 309(which makes passes at compilers) written by James Hacker. 310 311signature of Ty Coon, 1 April 1989 Ty Coon, President of Vice 312