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0001 GNU GENERAL PUBLIC LICENSE 0002 Version 2, June 1991 0003 0004 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 0005 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 0006 Everyone is permitted to copy and distribute verbatim copies 0007 of this license document, but changing it is not allowed. 0008 0009 Preamble 0010 0011 The licenses for most software are designed to take away your 0012 freedom to share and change it. By contrast, the GNU General Public 0013 License is intended to guarantee your freedom to share and change free 0014 software--to make sure the software is free for all its users. This 0015 General Public License applies to most of the Free Software 0016 Foundation's software and to any other program whose authors commit to 0017 using it. (Some other Free Software Foundation software is covered by 0018 the GNU Lesser General Public License instead.) You can apply it to 0019 your programs, too. 0020 0021 When we speak of free software, we are referring to freedom, not 0022 price. Our General Public Licenses are designed to make sure that you 0023 have the freedom to distribute copies of free software (and charge for 0024 this service if you wish), that you receive source code or can get it 0025 if you want it, that you can change the software or use pieces of it 0026 in new free programs; and that you know you can do these things. 0027 0028 To protect your rights, we need to make restrictions that forbid 0029 anyone to deny you these rights or to ask you to surrender the rights. 0030 These restrictions translate to certain responsibilities for you if you 0031 distribute copies of the software, or if you modify it. 0032 0033 For example, if you distribute copies of such a program, whether 0034 gratis or for a fee, you must give the recipients all the rights that 0035 you have. You must make sure that they, too, receive or can get the 0036 source code. And you must show them these terms so they know their 0037 rights. 0038 0039 We protect your rights with two steps: (1) copyright the software, and 0040 (2) offer you this license which gives you legal permission to copy, 0041 distribute and/or modify the software. 0042 0043 Also, for each author's protection and ours, we want to make certain 0044 that everyone understands that there is no warranty for this free 0045 software. If the software is modified by someone else and passed on, we 0046 want its recipients to know that what they have is not the original, so 0047 that any problems introduced by others will not reflect on the original 0048 authors' reputations. 0049 0050 Finally, any free program is threatened constantly by software 0051 patents. We wish to avoid the danger that redistributors of a free 0052 program will individually obtain patent licenses, in effect making the 0053 program proprietary. To prevent this, we have made it clear that any 0054 patent must be licensed for everyone's free use or not licensed at all. 0055 0056 The precise terms and conditions for copying, distribution and 0057 modification follow. 0058 0059 GNU GENERAL PUBLIC LICENSE 0060 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0061 0062 0. This License applies to any program or other work which contains 0063 a notice placed by the copyright holder saying it may be distributed 0064 under the terms of this General Public License. The "Program", below, 0065 refers to any such program or work, and a "work based on the Program" 0066 means either the Program or any derivative work under copyright law: 0067 that is to say, a work containing the Program or a portion of it, 0068 either verbatim or with modifications and/or translated into another 0069 language. (Hereinafter, translation is included without limitation in 0070 the term "modification".) Each licensee is addressed as "you". 0071 0072 Activities other than copying, distribution and modification are not 0073 covered by this License; they are outside its scope. The act of 0074 running the Program is not restricted, and the output from the Program 0075 is covered only if its contents constitute a work based on the 0076 Program (independent of having been made by running the Program). 0077 Whether that is true depends on what the Program does. 0078 0079 1. You may copy and distribute verbatim copies of the Program's 0080 source code as you receive it, in any medium, provided that you 0081 conspicuously and appropriately publish on each copy an appropriate 0082 copyright notice and disclaimer of warranty; keep intact all the 0083 notices that refer to this License and to the absence of any warranty; 0084 and give any other recipients of the Program a copy of this License 0085 along with the Program. 0086 0087 You may charge a fee for the physical act of transferring a copy, and 0088 you may at your option offer warranty protection in exchange for a fee. 0089 0090 2. You may modify your copy or copies of the Program or any portion 0091 of it, thus forming a work based on the Program, and copy and 0092 distribute such modifications or work under the terms of Section 1 0093 above, provided that you also meet all of these conditions: 0094 0095 a) You must cause the modified files to carry prominent notices 0096 stating that you changed the files and the date of any change. 0097 0098 b) You must cause any work that you distribute or publish, that in 0099 whole or in part contains or is derived from the Program or any 0100 part thereof, to be licensed as a whole at no charge to all third 0101 parties under the terms of this License. 0102 0103 c) If the modified program normally reads commands interactively 0104 when run, you must cause it, when started running for such 0105 interactive use in the most ordinary way, to print or display an 0106 announcement including an appropriate copyright notice and a 0107 notice that there is no warranty (or else, saying that you provide 0108 a warranty) and that users may redistribute the program under 0109 these conditions, and telling the user how to view a copy of this 0110 License. (Exception: if the Program itself is interactive but 0111 does not normally print such an announcement, your work based on 0112 the Program is not required to print an announcement.) 0113 0114 These requirements apply to the modified work as a whole. If 0115 identifiable sections of that work are not derived from the Program, 0116 and can be reasonably considered independent and separate works in 0117 themselves, then this License, and its terms, do not apply to those 0118 sections when you distribute them as separate works. But when you 0119 distribute the same sections as part of a whole which is a work based 0120 on the Program, the distribution of the whole must be on the terms of 0121 this License, whose permissions for other licensees extend to the 0122 entire whole, and thus to each and every part regardless of who wrote it. 0123 0124 Thus, it is not the intent of this section to claim rights or contest 0125 your rights to work written entirely by you; rather, the intent is to 0126 exercise the right to control the distribution of derivative or 0127 collective works based on the Program. 0128 0129 In addition, mere aggregation of another work not based on the Program 0130 with the Program (or with a work based on the Program) on a volume of 0131 a storage or distribution medium does not bring the other work under 0132 the scope of this License. 0133 0134 3. You may copy and distribute the Program (or a work based on it, 0135 under Section 2) in object code or executable form under the terms of 0136 Sections 1 and 2 above provided that you also do one of the following: 0137 0138 a) Accompany it with the complete corresponding machine-readable 0139 source code, which must be distributed under the terms of Sections 0140 1 and 2 above on a medium customarily used for software interchange; or, 0141 0142 b) Accompany it with a written offer, valid for at least three 0143 years, to give any third party, for a charge no more than your 0144 cost of physically performing source distribution, a complete 0145 machine-readable copy of the corresponding source code, to be 0146 distributed under the terms of Sections 1 and 2 above on a medium 0147 customarily used for software interchange; or, 0148 0149 c) Accompany it with the information you received as to the offer 0150 to distribute corresponding source code. (This alternative is 0151 allowed only for noncommercial distribution and only if you 0152 received the program in object code or executable form with such 0153 an offer, in accord with Subsection b above.) 0154 0155 The source code for a work means the preferred form of the work for 0156 making modifications to it. For an executable work, complete source 0157 code means all the source code for all modules it contains, plus any 0158 associated interface definition files, plus the scripts used to 0159 control compilation and installation of the executable. However, as a 0160 special exception, the source code distributed need not include 0161 anything that is normally distributed (in either source or binary 0162 form) with the major components (compiler, kernel, and so on) of the 0163 operating system on which the executable runs, unless that component 0164 itself accompanies the executable. 0165 0166 If distribution of executable or object code is made by offering 0167 access to copy from a designated place, then offering equivalent 0168 access to copy the source code from the same place counts as 0169 distribution of the source code, even though third parties are not 0170 compelled to copy the source along with the object code. 0171 0172 4. You may not copy, modify, sublicense, or distribute the Program 0173 except as expressly provided under this License. Any attempt 0174 otherwise to copy, modify, sublicense or distribute the Program is 0175 void, and will automatically terminate your rights under this License. 0176 However, parties who have received copies, or rights, from you under 0177 this License will not have their licenses terminated so long as such 0178 parties remain in full compliance. 0179 0180 5. You are not required to accept this License, since you have not 0181 signed it. However, nothing else grants you permission to modify or 0182 distribute the Program or its derivative works. These actions are 0183 prohibited by law if you do not accept this License. Therefore, by 0184 modifying or distributing the Program (or any work based on the 0185 Program), you indicate your acceptance of this License to do so, and 0186 all its terms and conditions for copying, distributing or modifying 0187 the Program or works based on it. 0188 0189 6. Each time you redistribute the Program (or any work based on the 0190 Program), the recipient automatically receives a license from the 0191 original licensor to copy, distribute or modify the Program subject to 0192 these terms and conditions. You may not impose any further 0193 restrictions on the recipients' exercise of the rights granted herein. 0194 You are not responsible for enforcing compliance by third parties to 0195 this License. 0196 0197 7. If, as a consequence of a court judgment or allegation of patent 0198 infringement or for any other reason (not limited to patent issues), 0199 conditions are imposed on you (whether by court order, agreement or 0200 otherwise) that contradict the conditions of this License, they do not 0201 excuse you from the conditions of this License. If you cannot 0202 distribute so as to satisfy simultaneously your obligations under this 0203 License and any other pertinent obligations, then as a consequence you 0204 may not distribute the Program at all. For example, if a patent 0205 license would not permit royalty-free redistribution of the Program by 0206 all those who receive copies directly or indirectly through you, then 0207 the only way you could satisfy both it and this License would be to 0208 refrain entirely from distribution of the Program. 0209 0210 If any portion of this section is held invalid or unenforceable under 0211 any particular circumstance, the balance of the section is intended to 0212 apply and the section as a whole is intended to apply in other 0213 circumstances. 0214 0215 It is not the purpose of this section to induce you to infringe any 0216 patents or other property right claims or to contest validity of any 0217 such claims; this section has the sole purpose of protecting the 0218 integrity of the free software distribution system, which is 0219 implemented by public license practices. Many people have made 0220 generous contributions to the wide range of software distributed 0221 through that system in reliance on consistent application of that 0222 system; it is up to the author/donor to decide if he or she is willing 0223 to distribute software through any other system and a licensee cannot 0224 impose that choice. 0225 0226 This section is intended to make thoroughly clear what is believed to 0227 be a consequence of the rest of this License. 0228 0229 8. If the distribution and/or use of the Program is restricted in 0230 certain countries either by patents or by copyrighted interfaces, the 0231 original copyright holder who places the Program under this License 0232 may add an explicit geographical distribution limitation excluding 0233 those countries, so that distribution is permitted only in or among 0234 countries not thus excluded. In such case, this License incorporates 0235 the limitation as if written in the body of this License. 0236 0237 9. The Free Software Foundation may publish revised and/or new versions 0238 of the General Public License from time to time. Such new versions will 0239 be similar in spirit to the present version, but may differ in detail to 0240 address new problems or concerns. 0241 0242 Each version is given a distinguishing version number. If the Program 0243 specifies a version number of this License which applies to it and "any 0244 later version", you have the option of following the terms and conditions 0245 either of that version or of any later version published by the Free 0246 Software Foundation. If the Program does not specify a version number of 0247 this License, you may choose any version ever published by the Free Software 0248 Foundation. 0249 0250 10. If you wish to incorporate parts of the Program into other free 0251 programs whose distribution conditions are different, write to the author 0252 to ask for permission. For software which is copyrighted by the Free 0253 Software Foundation, write to the Free Software Foundation; we sometimes 0254 make exceptions for this. Our decision will be guided by the two goals 0255 of preserving the free status of all derivatives of our free software and 0256 of promoting the sharing and reuse of software generally. 0257 0258 NO WARRANTY 0259 0260 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 0261 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 0262 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 0263 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 0264 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 0265 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 0266 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 0267 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 0268 REPAIR OR CORRECTION. 0269 0270 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 0271 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 0272 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 0273 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 0274 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 0275 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 0276 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 0277 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 0278 POSSIBILITY OF SUCH DAMAGES. 0279 0280 END OF TERMS AND CONDITIONS 0281 0282 How to Apply These Terms to Your New Programs 0283 0284 If you develop a new program, and you want it to be of the greatest 0285 possible use to the public, the best way to achieve this is to make it 0286 free software which everyone can redistribute and change under these terms. 0287 0288 To do so, attach the following notices to the program. It is safest 0289 to attach them to the start of each source file to most effectively 0290 convey the exclusion of warranty; and each file should have at least 0291 the "copyright" line and a pointer to where the full notice is found. 0292 0293 <one line to give the program's name and a brief idea of what it does.> 0294 Copyright (C) <year> <name of author> 0295 0296 This program is free software; you can redistribute it and/or modify 0297 it under the terms of the GNU General Public License as published by 0298 the Free Software Foundation; either version 2 of the License, or 0299 (at your option) any later version. 0300 0301 This program is distributed in the hope that it will be useful, 0302 but WITHOUT ANY WARRANTY; without even the implied warranty of 0303 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0304 GNU General Public License for more details. 0305 0306 You should have received a copy of the GNU General Public License along 0307 with this program; if not, write to the Free Software Foundation, Inc., 0308 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 0309 0310 Also add information on how to contact you by electronic and paper mail. 0311 0312 If the program is interactive, make it output a short notice like this 0313 when it starts in an interactive mode: 0314 0315 Gnomovision version 69, Copyright (C) year name of author 0316 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 0317 This is free software, and you are welcome to redistribute it 0318 under certain conditions; type `show c' for details. 0319 0320 The hypothetical commands `show w' and `show c' should show the appropriate 0321 parts of the General Public License. Of course, the commands you use may 0322 be called something other than `show w' and `show c'; they could even be 0323 mouse-clicks or menu items--whatever suits your program. 0324 0325 You should also get your employer (if you work as a programmer) or your 0326 school, if any, to sign a "copyright disclaimer" for the program, if 0327 necessary. Here is a sample; alter the names: 0328 0329 Yoyodyne, Inc., hereby disclaims all copyright interest in the program 0330 `Gnomovision' (which makes passes at compilers) written by James Hacker. 0331 0332 <signature of Ty Coon>, 1 April 1989 0333 Ty Coon, President of Vice 0334 0335 This General Public License does not permit incorporating your program into 0336 proprietary programs. If your program is a subroutine library, you may 0337 consider it more useful to permit linking proprietary applications with the 0338 library. If this is what you want to do, use the GNU Lesser General 0339 Public License instead of this License.