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