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