1 2 The GNU General Public License (GPL) 3 Version 2, June 1991 4 5 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 6 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 freedom to 13 share and change it. By contrast, the GNU General Public License is 14 intended to guarantee your freedom to share and change free software--to 15 make sure the software is free for all its users. This General Public 16 License applies to most of the Free Software Foundation's software and to 17 any other program whose authors commit to using it. (Some other Free 18 Software Foundation software is covered by the GNU Library General Public 19 License instead.) You can apply it to your programs, too. 20 21 When we speak of free software, we are referring to freedom, not price. 22 Our General Public Licenses are designed to make sure that you have the 23 freedom to distribute copies of free software (and charge for this service 24 if you wish), that you receive source code or can get it if you want it, 25 that you can change the software or use pieces of it in new free programs; 26 and that you know you can do these things. 27 28 To protect your rights, we need to make restrictions that forbid anyone to 29 deny you these rights or to ask you to surrender the rights. These 30 restrictions translate to certain responsibilities for you if you 31 distribute copies of the software, or if you modify it. 32 33 For example, if you distribute copies of such a program, whether gratis or 34 for a fee, you must give the recipients all the rights that you have. You 35 must make sure that they, too, receive or can get the source code. And you 36 must show them these terms so they know their rights. 37 38 We protect your rights with two steps: (1) copyright the software, and (2) 39 offer you this license which gives you legal permission to copy, 40 distribute and/or modify the software. 41 42 Also, for each author's protection and ours, we want to make certain that 43 everyone understands that there is no warranty for this free software. If 44 the software is modified by someone else and passed on, we want its 45 recipients to know that what they have is not the original, so that any 46 problems introduced by others will not reflect on the original authors' 47 reputations. 48 49 Finally, any free program is threatened constantly by software patents. We 50 wish to avoid the danger that redistributors of a free program will 51 individually obtain patent licenses, in effect making the program 52 proprietary. To prevent this, we have made it clear that any patent must 53 be licensed for everyone's free use or not licensed at all. 54 55 The precise terms and conditions for copying, distribution and 56 modification follow. 57 58 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 59 60 0. This License applies to any program or other work which contains a 61 notice placed by the copyright holder saying it may be distributed under 62 the terms of this General Public License. The "Program", below, refers to 63 any such program or work, and a "work based on the Program" means either 64 the Program or any derivative work under copyright law: that is to say, a 65 work containing the Program or a portion of it, either verbatim or with 66 modifications and/or translated into another language. (Hereinafter, 67 translation is included without limitation in the term "modification".) 68 Each licensee is addressed as "you". 69 70 Activities other than copying, distribution and modification are not 71 covered by this License; they are outside its scope. The act of running 72 the Program is not restricted, and the output from the Program is covered 73 only if its contents constitute a work based on the Program (independent 74 of having been made by running the Program). Whether that is true depends 75 on what the Program does. 76 77 1. You may copy and distribute verbatim copies of the Program's source 78 code as you receive it, in any medium, provided that you conspicuously and 79 appropriately publish on each copy an appropriate copyright notice and 80 disclaimer of warranty; keep intact all the notices that refer to this 81 License and to the absence of any warranty; and give any other recipients 82 of the Program a copy of this License along with the Program. 83 84 You may charge a fee for the physical act of transferring a copy, and you 85 may at your option offer warranty protection in exchange for a fee. 86 87 2. You may modify your copy or copies of the Program or any portion of it, 88 thus forming a work based on the Program, and copy and distribute such 89 modifications or work under the terms of Section 1 above, provided that 90 you also meet all of these conditions: 91 92 a) You must cause the modified files to carry prominent notices stating 93 that you changed the files and the date of any change. 94 95 b) You must cause any work that you distribute or publish, that in whole 96 or in part contains or is derived from the Program or any part thereof, 97 to be licensed as a whole at no charge to all third parties under the 98 terms of this License. 99 100 c) If the modified program normally reads commands interactively when 101 run, you must cause it, when started running for such interactive use in 102 the most ordinary way, to print or display an announcement including an 103 appropriate copyright notice and a notice that there is no warranty (or 104 else, saying that you provide a warranty) and that users may 105 redistribute the program under these conditions, and telling the user 106 how to view a copy of this License. (Exception: if the Program itself is 107 interactive but does not normally print such an announcement, your work 108 based on the Program is not required to print an announcement.) 109 110 These requirements apply to the modified work as a whole. If identifiable 111 sections of that work are not derived from the Program, and can be 112 reasonably considered independent and separate works in themselves, then 113 this License, and its terms, do not apply to those sections when you 114 distribute them as separate works. But when you distribute the same 115 sections as part of a whole which is a work based on the Program, the 116 distribution of the whole must be on the terms of this License, whose 117 permissions for other licensees extend to the entire whole, and thus to 118 each and every part regardless of who wrote it. 119 120 Thus, it is not the intent of this section to claim rights or contest your 121 rights to work written entirely by you; rather, the intent is to exercise 122 the right to control the distribution of derivative or collective works 123 based on the Program. 124 125 In addition, mere aggregation of another work not based on the Program 126 with the Program (or with a work based on the Program) on a volume of a 127 storage or distribution medium does not bring the other work under the 128 scope of this License. 129 130 3. You may copy and distribute the Program (or a work based on it, under 131 Section 2) in object code or executable form under the terms of Sections 1 132 and 2 above provided that you also do one of the following: 133 134 a) Accompany it with the complete corresponding machine-readable source 135 code, which must be distributed under the terms of Sections 1 and 2 136 above on a medium customarily used for software interchange; or, 137 138 b) Accompany it with a written offer, valid for at least three years, to 139 give any third party, for a charge no more than your cost of physically 140 performing source distribution, a complete machine-readable copy of the 141 corresponding source code, to be distributed under the terms of Sections 142 1 and 2 above on a medium customarily used for software interchange; or, 143 144 c) Accompany it with the information you received as to the offer to 145 distribute corresponding source code. (This alternative is allowed only 146 for noncommercial distribution and only if you received the program in 147 object code or executable form with such an offer, in accord with 148 Subsection b above.) 149 150 The source code for a work means the preferred form of the work for making 151 modifications to it. For an executable work, complete source code means 152 all the source code for all modules it contains, plus any associated 153 interface definition files, plus the scripts used to control compilation 154 and installation of the executable. However, as a special exception, the 155 source code distributed need not include anything that is normally 156 distributed (in either source or binary form) with the major components 157 (compiler, kernel, and so on) of the operating system on which the 158 executable runs, unless that component itself accompanies the executable. 159 160 If distribution of executable or object code is made by offering access to 161 copy from a designated place, then offering equivalent access to copy the 162 source code from the same place counts as distribution of the source code, 163 even though third parties are not compelled to copy the source along with 164 the object code. 165 166 4. You may not copy, modify, sublicense, or distribute the Program except 167 as expressly provided under this License. Any attempt otherwise to copy, 168 modify, sublicense or distribute the Program is void, and will 169 automatically terminate your rights under this License. However, parties 170 who have received copies, or rights, from you under this License will not 171 have their licenses terminated so long as such parties remain in full 172 compliance. 173 174 5. You are not required to accept this License, since you have not signed 175 it. However, nothing else grants you permission to modify or distribute 176 the Program or its derivative works. These actions are prohibited by law 177 if you do not accept this License. Therefore, by modifying or distributing 178 the Program (or any work based on the Program), you indicate your 179 acceptance of this License to do so, and all its terms and conditions for 180 copying, distributing or modifying the Program or works based on it. 181 182 6. Each time you redistribute the Program (or any work based on the 183 Program), the recipient automatically receives a license from the original 184 licensor to copy, distribute or modify the Program subject to these terms 185 and conditions. You may not impose any further restrictions on the 186 recipients' exercise of the rights granted herein. You are not responsible 187 for enforcing compliance by third parties to this License. 188 189 7. If, as a consequence of a court judgment or allegation of patent 190 infringement or for any other reason (not limited to patent issues), 191 conditions are imposed on you (whether by court order, agreement or 192 otherwise) that contradict the conditions of this License, they do not 193 excuse you from the conditions of this License. If you cannot distribute 194 so as to satisfy simultaneously your obligations under this License and 195 any other pertinent obligations, then as a consequence you may not 196 distribute the Program at all. For example, if a patent license would not 197 permit royalty-free redistribution of the Program by all those who receive 198 copies directly or indirectly through you, then the only way you could 199 satisfy both it and this License would be to refrain entirely from 200 distribution of the Program. 201 202 If any portion of this section is held invalid or unenforceable under any 203 particular circumstance, the balance of the section is intended to apply 204 and the section as a whole is intended to apply in other circumstances. 205 206 It is not the purpose of this section to induce you to infringe any 207 patents or other property right claims or to contest validity of any such 208 claims; this section has the sole purpose of protecting the integrity of 209 the free software distribution system, which is implemented by public 210 license practices. Many people have made generous contributions to the 211 wide range of software distributed through that system in reliance on 212 consistent application of that system; it is up to the author/donor to 213 decide if he or she is willing to distribute software through any other 214 system and a licensee cannot impose that choice. 215 216 This section is intended to make thoroughly clear what is believed to be a 217 consequence of the rest of this License. 218 219 8. If the distribution and/or use of the Program is restricted in certain 220 countries either by patents or by copyrighted interfaces, the original 221 copyright holder who places the Program under this License may add an 222 explicit geographical distribution limitation excluding those countries, 223 so that distribution is permitted only in or among countries not thus 224 excluded. In such case, this License incorporates the limitation as if 225 written in the body of this License. 226 227 9. The Free Software Foundation may publish revised and/or new versions of 228 the General Public License from time to time. Such new versions will be 229 similar in spirit to the present version, but may differ in detail to 230 address new problems or concerns. 231 232 Each version is given a distinguishing version number. If the Program 233 specifies a version number of this License which applies to it and "any 234 later version", you have the option of following the terms and conditions 235 either of that version or of any later version published by the Free 236 Software Foundation. If the Program does not specify a version number of 237 this License, you may choose any version ever published by the Free 238 Software Foundation. 239 240 10. If you wish to incorporate parts of the Program into other free 241 programs whose distribution conditions are different, write to the author 242 to ask for permission. For software which is copyrighted by the Free 243 Software Foundation, write to the Free Software Foundation; we sometimes 244 make exceptions for this. Our decision will be guided by the two goals of 245 preserving the free status of all derivatives of our free software and of 246 promoting the sharing and reuse of software generally. 247 248 NO WARRANTY 249 250 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 251 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 252 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 253 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 254 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 255 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 256 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 257 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 258 REPAIR OR CORRECTION. 259 260 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 261 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 262 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 263 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES 264 ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT 265 LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES 266 SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE 267 WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN 268 ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 269 270 END OF TERMS AND CONDITIONS 271 272 273