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0001 GNU GENERAL PUBLIC LICENSE 0002 0003 Version 2, June 1991 0004 0005 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 0006 0007 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 0008 0009 Everyone is permitted to copy and distribute verbatim copies of this license 0010 document, but changing it is not allowed. 0011 0012 Preamble 0013 0014 The licenses for most software are designed to take away your freedom to share 0015 and change it. By contrast, the GNU General Public License is intended to 0016 guarantee your freedom to share and change free software--to make sure the 0017 software is free for all its users. This General Public License applies to 0018 most of the Free Software Foundation's software and to any other program whose 0019 authors commit to using it. (Some other Free Software Foundation software 0020 is covered by the GNU Lesser General Public License instead.) You can apply 0021 it to your programs, too. 0022 0023 When we speak of free software, we are referring to freedom, not price. Our 0024 General Public Licenses are designed to make sure that you have the freedom 0025 to distribute copies of free software (and charge for this service if you 0026 wish), that you receive source code or can get it if you want it, that you 0027 can change the software or use pieces of it in new free programs; and that 0028 you know you can do these things. 0029 0030 To protect your rights, we need to make restrictions that forbid anyone to 0031 deny you these rights or to ask you to surrender the rights. These restrictions 0032 translate to certain responsibilities for you if you distribute copies of 0033 the software, or if you modify it. 0034 0035 For example, if you distribute copies of such a program, whether gratis or 0036 for a fee, you must give the recipients all the rights that you have. You 0037 must make sure that they, too, receive or can get the source code. And you 0038 must show them these terms so they know their rights. 0039 0040 We protect your rights with two steps: (1) copyright the software, and (2) 0041 offer you this license which gives you legal permission to copy, distribute 0042 and/or modify the software. 0043 0044 Also, for each author's protection and ours, we want to make certain that 0045 everyone understands that there is no warranty for this free software. If 0046 the software is modified by someone else and passed on, we want its recipients 0047 to know that what they have is not the original, so that any problems introduced 0048 by others will not reflect on the original authors' reputations. 0049 0050 Finally, any free program is threatened constantly by software patents. We 0051 wish to avoid the danger that redistributors of a free program will individually 0052 obtain patent licenses, in effect making the program proprietary. To prevent 0053 this, we have made it clear that any patent must be licensed for everyone's 0054 free use or not licensed at all. 0055 0056 The precise terms and conditions for copying, distribution and modification 0057 follow. 0058 0059 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0060 0061 0. This License applies to any program or other work which contains a notice 0062 placed by the copyright holder saying it may be distributed under the terms 0063 of this General Public License. The "Program", below, refers to any such program 0064 or work, and a "work based on the Program" means either the Program or any 0065 derivative work under copyright law: that is to say, a work containing the 0066 Program or a portion of it, either verbatim or with modifications and/or translated 0067 into another language. (Hereinafter, translation is included without limitation 0068 in the term "modification".) Each licensee is addressed as "you". 0069 0070 Activities other than copying, distribution and modification are not covered 0071 by this License; they are outside its scope. The act of running the Program 0072 is not restricted, and the output from the Program is covered only if its 0073 contents constitute a work based on the Program (independent of having been 0074 made by running the Program). Whether that is true depends on what the Program 0075 does. 0076 0077 1. You may copy and distribute verbatim copies of the Program's source code 0078 as you receive it, in any medium, provided that you conspicuously and appropriately 0079 publish on each copy an appropriate copyright notice and disclaimer of warranty; 0080 keep intact all the notices that refer to this License and to the absence 0081 of any warranty; and give any other recipients of the Program a copy of this 0082 License along with the Program. 0083 0084 You may charge a fee for the physical act of transferring a copy, and you 0085 may at your option offer warranty protection in exchange for a fee. 0086 0087 2. You may modify your copy or copies of the Program or any portion of it, 0088 thus forming a work based on the Program, and copy and distribute such modifications 0089 or work under the terms of Section 1 above, provided that you also meet all 0090 of these conditions: 0091 0092 a) You must cause the modified files to carry prominent notices stating that 0093 you changed the files and the date of any change. 0094 0095 b) You must cause any work that you distribute or publish, that in whole or 0096 in part contains or is derived from the Program or any part thereof, to be 0097 licensed as a whole at no charge to all third parties under the terms of this 0098 License. 0099 0100 c) If the modified program normally reads commands interactively when run, 0101 you must cause it, when started running for such interactive use in the most 0102 ordinary way, to print or display an announcement including an appropriate 0103 copyright notice and a notice that there is no warranty (or else, saying that 0104 you provide a warranty) and that users may redistribute the program under 0105 these conditions, and telling the user how to view a copy of this License. 0106 (Exception: if the Program itself is interactive but does not normally print 0107 such an announcement, your work based on the Program is not required to print 0108 an announcement.) 0109 0110 These requirements apply to the modified work as a whole. If identifiable 0111 sections of that work are not derived from the Program, and can be reasonably 0112 considered independent and separate works in themselves, then this License, 0113 and its terms, do not apply to those sections when you distribute them as 0114 separate works. But when you distribute the same sections as part of a whole 0115 which is a work based on the Program, the distribution of the whole must be 0116 on the terms of this License, whose permissions for other licensees extend 0117 to the entire whole, and thus to each and every part regardless of who wrote 0118 it. 0119 0120 Thus, it is not the intent of this section to claim rights or contest your 0121 rights to work written entirely by you; rather, the intent is to exercise 0122 the right to control the distribution of derivative or collective works based 0123 on the Program. 0124 0125 In addition, mere aggregation of another work not based on the Program with 0126 the Program (or with a work based on the Program) on a volume of a storage 0127 or distribution medium does not bring the other work under the scope of this 0128 License. 0129 0130 3. You may copy and distribute the Program (or a work based on it, under Section 0131 2) in object code or executable form under the terms of Sections 1 and 2 above 0132 provided that you also do one of the following: 0133 0134 a) Accompany it with the complete corresponding machine-readable source code, 0135 which must be distributed under the terms of Sections 1 and 2 above on a medium 0136 customarily used for software interchange; or, 0137 0138 b) Accompany it with a written offer, valid for at least three years, to give 0139 any third party, for a charge no more than your cost of physically performing 0140 source distribution, a complete machine-readable copy of the corresponding 0141 source code, to be distributed under the terms of Sections 1 and 2 above on 0142 a medium customarily used for software interchange; or, 0143 0144 c) Accompany it with the information you received as to the offer to distribute 0145 corresponding source code. (This alternative is allowed only for noncommercial 0146 distribution and only if you received the program in object code or executable 0147 form with such an offer, in accord with Subsection b above.) 0148 0149 The source code for a work means the preferred form of the work for making 0150 modifications to it. For an executable work, complete source code means all 0151 the source code for all modules it contains, plus any associated interface 0152 definition files, plus the scripts used to control compilation and installation 0153 of the executable. However, as a special exception, the source code distributed 0154 need not include anything that is normally distributed (in either source or 0155 binary form) with the major components (compiler, kernel, and so on) of the 0156 operating system on which the executable runs, unless that component itself 0157 accompanies the executable. 0158 0159 If distribution of executable or object code is made by offering access to 0160 copy from a designated place, then offering equivalent access to copy the 0161 source code from the same place counts as distribution of the source code, 0162 even though third parties are not compelled to copy the source along with 0163 the object code. 0164 0165 4. You may not copy, modify, sublicense, or distribute the Program except 0166 as expressly provided under this License. Any attempt otherwise to copy, modify, 0167 sublicense or distribute the Program is void, and will automatically terminate 0168 your rights under this License. However, parties who have received copies, 0169 or rights, from you under this License will not have their licenses terminated 0170 so long as such parties remain in full compliance. 0171 0172 5. You are not required to accept this License, since you have not signed 0173 it. However, nothing else grants you permission to modify or distribute the 0174 Program or its derivative works. These actions are prohibited by law if you 0175 do not accept this License. Therefore, by modifying or distributing the Program 0176 (or any work based on the Program), you indicate your acceptance of this License 0177 to do so, and all its terms and conditions for copying, distributing or modifying 0178 the Program or works based on it. 0179 0180 6. Each time you redistribute the Program (or any work based on the Program), 0181 the recipient automatically receives a license from the original licensor 0182 to copy, distribute or modify the Program subject to these terms and conditions. 0183 You may not impose any further restrictions on the recipients' exercise of 0184 the rights granted herein. You are not responsible for enforcing compliance 0185 by third parties to this License. 0186 0187 7. If, as a consequence of a court judgment or allegation of patent infringement 0188 or for any other reason (not limited to patent issues), conditions are imposed 0189 on you (whether by court order, agreement or otherwise) that contradict the 0190 conditions of this License, they do not excuse you from the conditions of 0191 this License. If you cannot distribute so as to satisfy simultaneously your 0192 obligations under this License and any other pertinent obligations, then as 0193 a consequence you may not distribute the Program at all. For example, if a 0194 patent license would not permit royalty-free redistribution of the Program 0195 by all those who receive copies directly or indirectly through you, then the 0196 only way you could satisfy both it and this License would be to refrain entirely 0197 from distribution of the Program. 0198 0199 If any portion of this section is held invalid or unenforceable under any 0200 particular circumstance, the balance of the section is intended to apply and 0201 the section as a whole is intended to apply in other circumstances. 0202 0203 It is not the purpose of this section to induce you to infringe any patents 0204 or other property right claims or to contest validity of any such claims; 0205 this section has the sole purpose of protecting the integrity of the free 0206 software distribution system, which is implemented by public license practices. 0207 Many people have made generous contributions to the wide range of software 0208 distributed through that system in reliance on consistent application of that 0209 system; it is up to the author/donor to decide if he or she is willing to 0210 distribute software through any other system and a licensee cannot impose 0211 that choice. 0212 0213 This section is intended to make thoroughly clear what is believed to be a 0214 consequence of the rest of this License. 0215 0216 8. If the distribution and/or use of the Program is restricted in certain 0217 countries either by patents or by copyrighted interfaces, the original copyright 0218 holder who places the Program under this License may add an explicit geographical 0219 distribution limitation excluding those countries, so that distribution is 0220 permitted only in or among countries not thus excluded. In such case, this 0221 License incorporates the limitation as if written in the body of this License. 0222 0223 9. The Free Software Foundation may publish revised and/or new versions of 0224 the General Public License from time to time. Such new versions will be similar 0225 in spirit to the present version, but may differ in detail to address new 0226 problems or concerns. 0227 0228 Each version is given a distinguishing version number. If the Program specifies 0229 a version number of this License which applies to it and "any later version", 0230 you have the option of following the terms and conditions either of that version 0231 or of any later version published by the Free Software Foundation. If the 0232 Program does not specify a version number of this License, you may choose 0233 any version ever published by the Free Software Foundation. 0234 0235 10. If you wish to incorporate parts of the Program into other free programs 0236 whose distribution conditions are different, write to the author to ask for 0237 permission. For software which is copyrighted by the Free Software Foundation, 0238 write to the Free Software Foundation; we sometimes make exceptions for this. 0239 Our decision will be guided by the two goals of preserving the free status 0240 of all derivatives of our free software and of promoting the sharing and reuse 0241 of software generally. 0242 0243 NO WARRANTY 0244 0245 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR 0246 THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE 0247 STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM 0248 "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, 0249 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 0250 FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE 0251 OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 0252 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 0253 0254 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 0255 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE 0256 THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 0257 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE 0258 OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA 0259 OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES 0260 OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH 0261 HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 0262 END OF TERMS AND CONDITIONS 0263 0264 How to Apply These Terms to Your New Programs 0265 0266 If you develop a new program, and you want it to be of the greatest possible 0267 use to the public, the best way to achieve this is to make it free software 0268 which everyone can redistribute and change under these terms. 0269 0270 To do so, attach the following notices to the program. It is safest to attach 0271 them to the start of each source file to most effectively convey the exclusion 0272 of warranty; and each file should have at least the "copyright" line and a 0273 pointer to where the full notice is found. 0274 0275 <one line to give the program's name and an idea of what it does.> 0276 0277 Copyright (C) <yyyy> <name of author> 0278 0279 This program is free software; you can redistribute it and/or modify it under 0280 the terms of the GNU General Public License as published by the Free Software 0281 Foundation; either version 2 of the License, or (at your option) any later 0282 version. 0283 0284 This program is distributed in the hope that it will be useful, but WITHOUT 0285 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 0286 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 0287 0288 You should have received a copy of the GNU General Public License along with 0289 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin 0290 Street, Fifth Floor, Boston, MA 02110-1301, USA. 0291 0292 Also add information on how to contact you by electronic and paper mail. 0293 0294 If the program is interactive, make it output a short notice like this when 0295 it starts in an interactive mode: 0296 0297 Gnomovision version 69, Copyright (C) year name of author Gnomovision comes 0298 with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, 0299 and you are welcome to redistribute it under certain conditions; type `show 0300 c' for details. 0301 0302 The hypothetical commands `show w' and `show c' should show the appropriate 0303 parts of the General Public License. Of course, the commands you use may be 0304 called something other than `show w' and `show c'; they could even be mouse-clicks 0305 or menu items--whatever suits your program. 0306 0307 You should also get your employer (if you work as a programmer) or your school, 0308 if any, to sign a "copyright disclaimer" for the program, if necessary. Here 0309 is a sample; alter the names: 0310 0311 Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' 0312 (which makes passes at compilers) written by James Hacker. 0313 0314 <signature of Ty Coon>, 1 April 1989 Ty Coon, President of Vice This General 0315 Public License does not permit incorporating your program into proprietary 0316 programs. If your program is a subroutine library, you may consider it more 0317 useful to permit linking proprietary applications with the library. If this 0318 is what you want to do, use the GNU Lesser General Public License instead 0319 of this License.