1All code in this package, including the code from the extensions, 2is released under the GPL license, which you find hereafter. 3 4 GNU GENERAL PUBLIC LICENSE 5 Version 2, June 1991 6 7 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 8 675 Mass Ave, Cambridge, MA 02139, USA 9 Everyone is permitted to copy and distribute verbatim copies 10 of this license document, but changing it is not allowed. 11 12 Preamble 13 14 The licenses for most software are designed to take away your 15freedom to share and change it. By contrast, the GNU General Public 16License is intended to guarantee your freedom to share and change free 17software--to make sure the software is free for all its users. This 18General Public License applies to most of the Free Software 19Foundation's software and to any other program whose authors commit to 20using it. (Some other Free Software Foundation software is covered by 21the GNU Library General Public License instead.) You can apply it to 22your programs, too. 23 24 When we speak of free software, we are referring to freedom, not 25price. Our General Public Licenses are designed to make sure that you 26have the freedom to distribute copies of free software (and charge for 27this service if you wish), that you receive source code or can get it 28if you want it, that you can change the software or use pieces of it 29in new free programs; and that you know you can do these things. 30 31 To protect your rights, we need to make restrictions that forbid 32anyone to deny you these rights or to ask you to surrender the rights. 33These restrictions translate to certain responsibilities for you if you 34distribute copies of the software, or if you modify it. 35 36 For example, if you distribute copies of such a program, whether 37gratis or for a fee, you must give the recipients all the rights that 38you have. You must make sure that they, too, receive or can get the 39source code. And you must show them these terms so they know their 40rights. 41 42 We protect your rights with two steps: (1) copyright the software, and 43(2) offer you this license which gives you legal permission to copy, 44distribute and/or modify the software. 45 46 Also, for each author's protection and ours, we want to make certain 47that everyone understands that there is no warranty for this free 48software. If the software is modified by someone else and passed on, we 49want its recipients to know that what they have is not the original, so 50that any problems introduced by others will not reflect on the original 51authors' reputations. 52 53 Finally, any free program is threatened constantly by software 54patents. We wish to avoid the danger that redistributors of a free 55program will individually obtain patent licenses, in effect making the 56program proprietary. To prevent this, we have made it clear that any 57patent must be licensed for everyone's free use or not licensed at all. 58 59 The precise terms and conditions for copying, distribution and 60modification follow. 61 62 GNU GENERAL PUBLIC LICENSE 63 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 64 65 0. This License applies to any program or other work which contains 66a notice placed by the copyright holder saying it may be distributed 67under the terms of this General Public License. The "Program", below, 68refers to any such program or work, and a "work based on the Program" 69means either the Program or any derivative work under copyright law: 70that is to say, a work containing the Program or a portion of it, 71either verbatim or with modifications and/or translated into another 72language. (Hereinafter, translation is included without limitation in 73the term "modification".) Each licensee is addressed as "you". 74 75Activities other than copying, distribution and modification are not 76covered by this License; they are outside its scope. The act of 77running the Program is not restricted, and the output from the Program 78is covered only if its contents constitute a work based on the 79Program (independent of having been made by running the Program). 80Whether that is true depends on what the Program does. 81 82 1. You may copy and distribute verbatim copies of the Program's 83source code as you receive it, in any medium, provided that you 84conspicuously and appropriately publish on each copy an appropriate 85copyright notice and disclaimer of warranty; keep intact all the 86notices that refer to this License and to the absence of any warranty; 87and give any other recipients of the Program a copy of this License 88along with the Program. 89 90You may charge a fee for the physical act of transferring a copy, and 91you may at your option offer warranty protection in exchange for a fee. 92 93 2. You may modify your copy or copies of the Program or any portion 94of it, thus forming a work based on the Program, and copy and 95distribute such modifications or work under the terms of Section 1 96above, provided that you also meet all of these conditions: 97 98 a) You must cause the modified files to carry prominent notices 99 stating that you changed the files and the date of any change. 100 101 b) You must cause any work that you distribute or publish, that in 102 whole or in part contains or is derived from the Program or any 103 part thereof, to be licensed as a whole at no charge to all third 104 parties under the terms of this License. 105 106 c) If the modified program normally reads commands interactively 107 when run, you must cause it, when started running for such 108 interactive use in the most ordinary way, to print or display an 109 announcement including an appropriate copyright notice and a 110 notice that there is no warranty (or else, saying that you provide 111 a warranty) and that users may redistribute the program under 112 these conditions, and telling the user how to view a copy of this 113 License. (Exception: if the Program itself is interactive but 114 does not normally print such an announcement, your work based on 115 the Program is not required to print an announcement.) 116 117These requirements apply to the modified work as a whole. If 118identifiable sections of that work are not derived from the Program, 119and can be reasonably considered independent and separate works in 120themselves, then this License, and its terms, do not apply to those 121sections when you distribute them as separate works. But when you 122distribute the same sections as part of a whole which is a work based 123on the Program, the distribution of the whole must be on the terms of 124this License, whose permissions for other licensees extend to the 125entire whole, and thus to each and every part regardless of who wrote it. 126 127Thus, it is not the intent of this section to claim rights or contest 128your rights to work written entirely by you; rather, the intent is to 129exercise the right to control the distribution of derivative or 130collective works based on the Program. 131 132In addition, mere aggregation of another work not based on the Program 133with the Program (or with a work based on the Program) on a volume of 134a storage or distribution medium does not bring the other work under 135the scope of this License. 136 137 3. You may copy and distribute the Program (or a work based on it, 138under Section 2) in object code or executable form under the terms of 139Sections 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 158The source code for a work means the preferred form of the work for 159making modifications to it. For an executable work, complete source 160code means all the source code for all modules it contains, plus any 161associated interface definition files, plus the scripts used to 162control compilation and installation of the executable. However, as a 163special exception, the source code distributed need not include 164anything that is normally distributed (in either source or binary 165form) with the major components (compiler, kernel, and so on) of the 166operating system on which the executable runs, unless that component 167itself accompanies the executable. 168 169If distribution of executable or object code is made by offering 170access to copy from a designated place, then offering equivalent 171access to copy the source code from the same place counts as 172distribution of the source code, even though third parties are not 173compelled to copy the source along with the object code. 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 8. If the distribution and/or use of the Program is restricted in 233certain countries either by patents or by copyrighted interfaces, the 234original copyright holder who places the Program under this License 235may add an explicit geographical distribution limitation excluding 236those countries, so that distribution is permitted only in or among 237countries not thus excluded. In such case, this License incorporates 238the limitation as if written in the body of this License. 239 240 9. The Free Software Foundation may publish revised and/or new versions 241of the General Public License from time to time. Such new versions will 242be similar in spirit to the present version, but may differ in detail to 243address new problems or concerns. 244 245Each version is given a distinguishing version number. If the Program 246specifies a version number of this License which applies to it and "any 247later version", you have the option of following the terms and conditions 248either of that version or of any later version published by the Free 249Software Foundation. If the Program does not specify a version number of 250this License, you may choose any version ever published by the Free Software 251Foundation. 252 253 10. If you wish to incorporate parts of the Program into other free 254programs whose distribution conditions are different, write to the author 255to ask for permission. For software which is copyrighted by the Free 256Software Foundation, write to the Free Software Foundation; we sometimes 257make exceptions for this. Our decision will be guided by the two goals 258of preserving the free status of all derivatives of our free software and 259of promoting the sharing and reuse of software generally. 260 261 NO WARRANTY 262 263 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 264FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 265OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 266PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 267OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 268MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 269TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 270PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 271REPAIR OR CORRECTION. 272 273 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 274WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 275REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 276INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 277OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 278TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 279YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 280PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 281POSSIBILITY OF SUCH DAMAGES. 282 283 END OF TERMS AND CONDITIONS 284 285 Appendix: How to Apply These Terms to Your New Programs 286 287 If you develop a new program, and you want it to be of the greatest 288possible use to the public, the best way to achieve this is to make it 289free software which everyone can redistribute and change under these terms. 290 291 To do so, attach the following notices to the program. It is safest 292to attach them to the start of each source file to most effectively 293convey the exclusion of warranty; and each file should have at least 294the "copyright" line and a pointer to where the full notice is found. 295 296 <one line to give the program's name and a brief idea of what it does.> 297 Copyright (C) 19yy <name of author> 298 299 This program is free software; you can redistribute it and/or modify 300 it under the terms of the GNU General Public License as published by 301 the Free Software Foundation; either version 2 of the License, or 302 (at your option) any later version. 303 304 This program is distributed in the hope that it will be useful, 305 but WITHOUT ANY WARRANTY; without even the implied warranty of 306 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 307 GNU General Public License for more details. 308 309 You should have received a copy of the GNU General Public License 310 along with this program; if not, write to the Free Software 311 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 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) 19yy 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. 343