1 GNU GENERAL PUBLIC LICENSE 2 Version 2, June 1991 3 4 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 5 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 6 Everyone is permitted to copy and distribute verbatim copies 7 of this license document, but changing it is not allowed. 8 9 Preamble 10 11 The licenses for most software are designed to take away your 12freedom to share and change it. By contrast, the GNU General Public 13License is intended to guarantee your freedom to share and change free 14software--to make sure the software is free for all its users. This 15General Public License applies to most of the Free Software 16Foundation's software and to any other program whose authors commit to 17using it. (Some other Free Software Foundation software is covered by 18the GNU Library General Public License instead.) You can apply it to 19your programs, too. 20 21 When we speak of free software, we are referring to freedom, not 22price. Our General Public Licenses are designed to make sure that you 23have the freedom to distribute copies of free software (and charge for 24this service if you wish), that you receive source code or can get it 25if you want it, that you can change the software or use pieces of it 26in new free programs; and that you know you can do these things. 27 28 To protect your rights, we need to make restrictions that forbid 29anyone to deny you these rights or to ask you to surrender the rights. 30These restrictions translate to certain responsibilities for you if you 31distribute copies of the software, or if you modify it. 32 33 For example, if you distribute copies of such a program, whether 34gratis or for a fee, you must give the recipients all the rights that 35you have. You must make sure that they, too, receive or can get the 36source code. And you must show them these terms so they know their 37rights. 38 39 We protect your rights with two steps: (1) copyright the software, and 40(2) offer you this license which gives you legal permission to copy, 41distribute and/or modify the software. 42 43 Also, for each author's protection and ours, we want to make certain 44that everyone understands that there is no warranty for this free 45software. If the software is modified by someone else and passed on, we 46want its recipients to know that what they have is not the original, so 47that any problems introduced by others will not reflect on the original 48authors' reputations. 49 50 Finally, any free program is threatened constantly by software 51patents. We wish to avoid the danger that redistributors of a free 52program will individually obtain patent licenses, in effect making the 53program proprietary. To prevent this, we have made it clear that any 54patent must be licensed for everyone's free use or not licensed at all. 55 56 The precise terms and conditions for copying, distribution and 57modification follow. 58 59 60 GNU GENERAL PUBLIC LICENSE 61 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 62 63 0. This License applies to any program or other work which contains 64a notice placed by the copyright holder saying it may be distributed 65under the terms of this General Public License. The "Program", below, 66refers to any such program or work, and a "work based on the Program" 67means either the Program or any derivative work under copyright law: 68that is to say, a work containing the Program or a portion of it, 69either verbatim or with modifications and/or translated into another 70language. (Hereinafter, translation is included without limitation in 71the term "modification".) Each licensee is addressed as "you". 72 73Activities other than copying, distribution and modification are not 74covered by this License; they are outside its scope. The act of 75running the Program is not restricted, and the output from the Program 76is covered only if its contents constitute a work based on the 77Program (independent of having been made by running the Program). 78Whether that is true depends on what the Program does. 79 80 1. You may copy and distribute verbatim copies of the Program's 81source code as you receive it, in any medium, provided that you 82conspicuously and appropriately publish on each copy an appropriate 83copyright notice and disclaimer of warranty; keep intact all the 84notices that refer to this License and to the absence of any warranty; 85and give any other recipients of the Program a copy of this License 86along with the Program. 87 88You may charge a fee for the physical act of transferring a copy, and 89you may at your option offer warranty protection in exchange for a fee. 90 91 2. You may modify your copy or copies of the Program or any portion 92of it, thus forming a work based on the Program, and copy and 93distribute such modifications or work under the terms of Section 1 94above, provided that you also meet all of these conditions: 95 96 a) You must cause the modified files to carry prominent notices 97 stating that you changed the files and the date of any change. 98 99 b) You must cause any work that you distribute or publish, that in 100 whole or in part contains or is derived from the Program or any 101 part thereof, to be licensed as a whole at no charge to all third 102 parties under the terms of this License. 103 104 c) If the modified program normally reads commands interactively 105 when run, you must cause it, when started running for such 106 interactive use in the most ordinary way, to print or display an 107 announcement including an appropriate copyright notice and a 108 notice that there is no warranty (or else, saying that you provide 109 a warranty) and that users may redistribute the program under 110 these conditions, and telling the user how to view a copy of this 111 License. (Exception: if the Program itself is interactive but 112 does not normally print such an announcement, your work based on 113 the Program is not required to print an announcement.) 114 115 116These requirements apply to the modified work as a whole. If 117identifiable sections of that work are not derived from the Program, 118and can be reasonably considered independent and separate works in 119themselves, then this License, and its terms, do not apply to those 120sections when you distribute them as separate works. But when you 121distribute the same sections as part of a whole which is a work based 122on the Program, the distribution of the whole must be on the terms of 123this License, whose permissions for other licensees extend to the 124entire whole, and thus to each and every part regardless of who wrote it. 125 126Thus, it is not the intent of this section to claim rights or contest 127your rights to work written entirely by you; rather, the intent is to 128exercise the right to control the distribution of derivative or 129collective works based on the Program. 130 131In addition, mere aggregation of another work not based on the Program 132with the Program (or with a work based on the Program) on a volume of 133a storage or distribution medium does not bring the other work under 134the scope of this License. 135 136 3. You may copy and distribute the Program (or a work based on it, 137under Section 2) in object code or executable form under the terms of 138Sections 1 and 2 above provided that you also do one of the following: 139 140 a) Accompany it with the complete corresponding machine-readable 141 source code, which must be distributed under the terms of Sections 142 1 and 2 above on a medium customarily used for software interchange; or, 143 144 b) Accompany it with a written offer, valid for at least three 145 years, to give any third party, for a charge no more than your 146 cost of physically performing source distribution, a complete 147 machine-readable copy of the corresponding source code, to be 148 distributed under the terms of Sections 1 and 2 above on a medium 149 customarily used for software interchange; or, 150 151 c) Accompany it with the information you received as to the offer 152 to distribute corresponding source code. (This alternative is 153 allowed only for noncommercial distribution and only if you 154 received the program in object code or executable form with such 155 an offer, in accord with Subsection b above.) 156 157The source code for a work means the preferred form of the work for 158making modifications to it. For an executable work, complete source 159code means all the source code for all modules it contains, plus any 160associated interface definition files, plus the scripts used to 161control compilation and installation of the executable. However, as a 162special exception, the source code distributed need not include 163anything that is normally distributed (in either source or binary 164form) with the major components (compiler, kernel, and so on) of the 165operating system on which the executable runs, unless that component 166itself accompanies the executable. 167 168If distribution of executable or object code is made by offering 169access to copy from a designated place, then offering equivalent 170access to copy the source code from the same place counts as 171distribution of the source code, even though third parties are not 172compelled to copy the source along with the object code. 173 174 175 4. You may not copy, modify, sublicense, or distribute the Program 176except as expressly provided under this License. Any attempt 177otherwise to copy, modify, sublicense or distribute the Program is 178void, and will automatically terminate your rights under this License. 179However, parties who have received copies, or rights, from you under 180this License will not have their licenses terminated so long as such 181parties remain in full compliance. 182 183 5. You are not required to accept this License, since you have not 184signed it. However, nothing else grants you permission to modify or 185distribute the Program or its derivative works. These actions are 186prohibited by law if you do not accept this License. Therefore, by 187modifying or distributing the Program (or any work based on the 188Program), you indicate your acceptance of this License to do so, and 189all its terms and conditions for copying, distributing or modifying 190the Program or works based on it. 191 192 6. Each time you redistribute the Program (or any work based on the 193Program), the recipient automatically receives a license from the 194original licensor to copy, distribute or modify the Program subject to 195these terms and conditions. You may not impose any further 196restrictions on the recipients' exercise of the rights granted herein. 197You are not responsible for enforcing compliance by third parties to 198this License. 199 200 7. If, as a consequence of a court judgment or allegation of patent 201infringement or for any other reason (not limited to patent issues), 202conditions are imposed on you (whether by court order, agreement or 203otherwise) that contradict the conditions of this License, they do not 204excuse you from the conditions of this License. If you cannot 205distribute so as to satisfy simultaneously your obligations under this 206License and any other pertinent obligations, then as a consequence you 207may not distribute the Program at all. For example, if a patent 208license would not permit royalty-free redistribution of the Program by 209all those who receive copies directly or indirectly through you, then 210the only way you could satisfy both it and this License would be to 211refrain entirely from distribution of the Program. 212 213If any portion of this section is held invalid or unenforceable under 214any particular circumstance, the balance of the section is intended to 215apply and the section as a whole is intended to apply in other 216circumstances. 217 218It is not the purpose of this section to induce you to infringe any 219patents or other property right claims or to contest validity of any 220such claims; this section has the sole purpose of protecting the 221integrity of the free software distribution system, which is 222implemented by public license practices. Many people have made 223generous contributions to the wide range of software distributed 224through that system in reliance on consistent application of that 225system; it is up to the author/donor to decide if he or she is willing 226to distribute software through any other system and a licensee cannot 227impose that choice. 228 229This section is intended to make thoroughly clear what is believed to 230be a consequence of the rest of this License. 231 232 233 8. If the distribution and/or use of the Program is restricted in 234certain countries either by patents or by copyrighted interfaces, the 235original copyright holder who places the Program under this License 236may add an explicit geographical distribution limitation excluding 237those countries, so that distribution is permitted only in or among 238countries not thus excluded. In such case, this License incorporates 239the limitation as if written in the body of this License. 240 241 9. The Free Software Foundation may publish revised and/or new versions 242of the General Public License from time to time. Such new versions will 243be similar in spirit to the present version, but may differ in detail to 244address new problems or concerns. 245 246Each version is given a distinguishing version number. If the Program 247specifies a version number of this License which applies to it and "any 248later version", you have the option of following the terms and conditions 249either of that version or of any later version published by the Free 250Software Foundation. If the Program does not specify a version number of 251this License, you may choose any version ever published by the Free Software 252Foundation. 253 254 10. If you wish to incorporate parts of the Program into other free 255programs whose distribution conditions are different, write to the author 256to ask for permission. For software which is copyrighted by the Free 257Software Foundation, write to the Free Software Foundation; we sometimes 258make exceptions for this. Our decision will be guided by the two goals 259of preserving the free status of all derivatives of our free software and 260of promoting the sharing and reuse of software generally. 261 262 NO WARRANTY 263 264 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 265FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 266OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 267PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 268OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 269MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 270TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 271PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 272REPAIR OR CORRECTION. 273 274 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 275WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 276REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 277INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 278OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 279TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 280YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 281PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 282POSSIBILITY OF SUCH DAMAGES. 283 284 END OF TERMS AND CONDITIONS 285 286 287 How to Apply These Terms to Your New Programs 288 289 If you develop a new program, and you want it to be of the greatest 290possible use to the public, the best way to achieve this is to make it 291free software which everyone can redistribute and change under these terms. 292 293 To do so, attach the following notices to the program. It is safest 294to attach them to the start of each source file to most effectively 295convey the exclusion of warranty; and each file should have at least 296the "copyright" line and a pointer to where the full notice is found. 297 298 <one line to give the program's name and a brief idea of what it does.> 299 Copyright (C) <year> <name of author> 300 301 This program is free software; you can redistribute it and/or modify 302 it under the terms of the GNU General Public License as published by 303 the Free Software Foundation; either version 2 of the License, or 304 (at your option) any later version. 305 306 This program is distributed in the hope that it will be useful, 307 but WITHOUT ANY WARRANTY; without even the implied warranty of 308 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 309 GNU General Public License for more details. 310 311 You should have received a copy of the GNU General Public License 312 along with this program; if not, write to the Free Software 313 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 314 315 316Also add information on how to contact you by electronic and paper mail. 317 318If the program is interactive, make it output a short notice like this 319when it starts in an interactive mode: 320 321 Gnomovision version 69, Copyright (C) year name of author 322 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 323 This is free software, and you are welcome to redistribute it 324 under certain conditions; type `show c' for details. 325 326The hypothetical commands `show w' and `show c' should show the appropriate 327parts of the General Public License. Of course, the commands you use may 328be called something other than `show w' and `show c'; they could even be 329mouse-clicks or menu items--whatever suits your program. 330 331You should also get your employer (if you work as a programmer) or your 332school, if any, to sign a "copyright disclaimer" for the program, if 333necessary. Here is a sample; alter the names: 334 335 Yoyodyne, Inc., hereby disclaims all copyright interest in the program 336 `Gnomovision' (which makes passes at compilers) written by James Hacker. 337 338 <signature of Ty Coon>, 1 April 1989 339 Ty Coon, President of Vice 340 341This General Public License does not permit incorporating your program into 342proprietary programs. If your program is a subroutine library, you may 343consider it more useful to permit linking proprietary applications with the 344library. If this is what you want to do, use the GNU Library General 345Public License instead of this License. 346