1 2 GNU GENERAL PUBLIC LICENSE 3 Version 2, June 1991 4 5--------------------------------------------------------------------- 6 7 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 8 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 9 Everyone is permitted to copy and distribute verbatim copies 10 of this license document, but changing it is not allowed. 11 12--------------------------------------------------------------------- 13 14 Preamble 15 16 The licenses for most software are designed to take away your 17freedom to share and change it. By contrast, the GNU General Public 18License is intended to guarantee your freedom to share and change free 19software--to make sure the software is free for all its users. This 20General Public License applies to most of the Free Software 21Foundation's software and to any other program whose authors commit to 22using it. (Some other Free Software Foundation software is covered by 23the GNU Library General Public License instead.) You can apply it to 24your programs, too. 25 26 When we speak of free software, we are referring to freedom, not 27price. Our General Public Licenses are designed to make sure that you 28have the freedom to distribute copies of free software (and charge for 29this service if you wish), that you receive source code or can get it 30if you want it, that you can change the software or use pieces of it 31in new free programs; and that you know you can do these things. 32 33 To protect your rights, we need to make restrictions that forbid 34anyone to deny you these rights or to ask you to surrender the rights. 35These restrictions translate to certain responsibilities for you if you 36distribute copies of the software, or if you modify it. 37 38 For example, if you distribute copies of such a program, whether 39gratis or for a fee, you must give the recipients all the rights that 40you have. You must make sure that they, too, receive or can get the 41source code. And you must show them these terms so they know their 42rights. 43 44 We protect your rights with two steps: (1) copyright the software, and 45(2) offer you this license which gives you legal permission to copy, 46distribute and/or modify the software. 47 48 Also, for each author's protection and ours, we want to make certain 49that everyone understands that there is no warranty for this free 50software. If the software is modified by someone else and passed on, we 51want its recipients to know that what they have is not the original, so 52that any problems introduced by others will not reflect on the original 53authors' reputations. 54 55 Finally, any free program is threatened constantly by software 56patents. We wish to avoid the danger that redistributors of a free 57program will individually obtain patent licenses, in effect making the 58program proprietary. To prevent this, we have made it clear that any 59patent must be licensed for everyone's free use or not licensed at all. 60 61 The precise terms and conditions for copying, distribution and 62modification follow. 63 64--------------------------------------------------------------------- 65 66 GNU GENERAL PUBLIC LICENSE 67 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 68 69 0. This License applies to any program or other work which contains 70a notice placed by the copyright holder saying it may be distributed 71under the terms of this General Public License. The "Program", below, 72refers to any such program or work, and a "work based on the Program" 73means either the Program or any derivative work under copyright law: 74that is to say, a work containing the Program or a portion of it, 75either verbatim or with modifications and/or translated into another 76language. (Hereinafter, translation is included without limitation in 77the term "modification".) Each licensee is addressed as "you". 78 79Activities other than copying, distribution and modification are not 80covered by this License; they are outside its scope. The act of 81running the Program is not restricted, and the output from the Program 82is covered only if its contents constitute a work based on the 83Program (independent of having been made by running the Program). 84Whether that is true depends on what the Program does. 85 86 1. You may copy and distribute verbatim copies of the Program's 87source code as you receive it, in any medium, provided that you 88conspicuously and appropriately publish on each copy an appropriate 89copyright notice and disclaimer of warranty; keep intact all the 90notices that refer to this License and to the absence of any warranty; 91and give any other recipients of the Program a copy of this License 92along with the Program. 93 94You may charge a fee for the physical act of transferring a copy, and 95you may at your option offer warranty protection in exchange for a fee. 96 97 2. You may modify your copy or copies of the Program or any portion 98of it, thus forming a work based on the Program, and copy and 99distribute such modifications or work under the terms of Section 1 100above, provided that you also meet all of these conditions: 101 102 a) You must cause the modified files to carry prominent notices 103 stating that you changed the files and the date of any change. 104 105 b) You must cause any work that you distribute or publish, that in 106 whole or in part contains or is derived from the Program or any 107 part thereof, to be licensed as a whole at no charge to all third 108 parties under the terms of this License. 109 110 c) If the modified program normally reads commands interactively 111 when run, you must cause it, when started running for such 112 interactive use in the most ordinary way, to print or display an 113 announcement including an appropriate copyright notice and a 114 notice that there is no warranty (or else, saying that you provide 115 a warranty) and that users may redistribute the program under 116 these conditions, and telling the user how to view a copy of this 117 License. (Exception: if the Program itself is interactive but 118 does not normally print such an announcement, your work based on 119 the Program is not required to print an announcement.) 120 121--------------------------------------------------------------------- 122 123These requirements apply to the modified work as a whole. If 124identifiable sections of that work are not derived from the Program, 125and can be reasonably considered independent and separate works in 126themselves, then this License, and its terms, do not apply to those 127sections when you distribute them as separate works. But when you 128distribute the same sections as part of a whole which is a work based 129on the Program, the distribution of the whole must be on the terms of 130this License, whose permissions for other licensees extend to the 131entire whole, and thus to each and every part regardless of who wrote it. 132 133Thus, it is not the intent of this section to claim rights or contest 134your rights to work written entirely by you; rather, the intent is to 135exercise the right to control the distribution of derivative or 136collective works based on the Program. 137 138In addition, mere aggregation of another work not based on the Program 139with the Program (or with a work based on the Program) on a volume of 140a storage or distribution medium does not bring the other work under 141the scope of this License. 142 143 3. You may copy and distribute the Program (or a work based on it, 144under Section 2) in object code or executable form under the terms of 145Sections 1 and 2 above provided that you also do one of the following: 146 147 a) Accompany it with the complete corresponding machine-readable 148 source code, which must be distributed under the terms of Sections 149 1 and 2 above on a medium customarily used for software interchange; or, 150 151 b) Accompany it with a written offer, valid for at least three 152 years, to give any third party, for a charge no more than your 153 cost of physically performing source distribution, a complete 154 machine-readable copy of the corresponding source code, to be 155 distributed under the terms of Sections 1 and 2 above on a medium 156 customarily used for software interchange; or, 157 158 c) Accompany it with the information you received as to the offer 159 to distribute corresponding source code. (This alternative is 160 allowed only for noncommercial distribution and only if you 161 received the program in object code or executable form with such 162 an offer, in accord with Subsection b above.) 163 164The source code for a work means the preferred form of the work for 165making modifications to it. For an executable work, complete source 166code means all the source code for all modules it contains, plus any 167associated interface definition files, plus the scripts used to 168control compilation and installation of the executable. However, as a 169special exception, the source code distributed need not include 170anything that is normally distributed (in either source or binary 171form) with the major components (compiler, kernel, and so on) of the 172operating system on which the executable runs, unless that component 173itself accompanies the executable. 174 175If distribution of executable or object code is made by offering 176access to copy from a designated place, then offering equivalent 177access to copy the source code from the same place counts as 178distribution of the source code, even though third parties are not 179compelled to copy the source along with the object code. 180 181--------------------------------------------------------------------- 182 183 4. You may not copy, modify, sublicense, or distribute the Program 184except as expressly provided under this License. Any attempt 185otherwise to copy, modify, sublicense or distribute the Program is 186void, and will automatically terminate your rights under this License. 187However, parties who have received copies, or rights, from you under 188this License will not have their licenses terminated so long as such 189parties remain in full compliance. 190 191 5. You are not required to accept this License, since you have not 192signed it. However, nothing else grants you permission to modify or 193distribute the Program or its derivative works. These actions are 194prohibited by law if you do not accept this License. Therefore, by 195modifying or distributing the Program (or any work based on the 196Program), you indicate your acceptance of this License to do so, and 197all its terms and conditions for copying, distributing or modifying 198the Program or works based on it. 199 200 6. Each time you redistribute the Program (or any work based on the 201Program), the recipient automatically receives a license from the 202original licensor to copy, distribute or modify the Program subject to 203these terms and conditions. You may not impose any further 204restrictions on the recipients' exercise of the rights granted herein. 205You are not responsible for enforcing compliance by third parties to 206this License. 207 208 7. If, as a consequence of a court judgment or allegation of patent 209infringement or for any other reason (not limited to patent issues), 210conditions are imposed on you (whether by court order, agreement or 211otherwise) that contradict the conditions of this License, they do not 212excuse you from the conditions of this License. If you cannot 213distribute so as to satisfy simultaneously your obligations under this 214License and any other pertinent obligations, then as a consequence you 215may not distribute the Program at all. For example, if a patent 216license would not permit royalty-free redistribution of the Program by 217all those who receive copies directly or indirectly through you, then 218the only way you could satisfy both it and this License would be to 219refrain entirely from distribution of the Program. 220 221If any portion of this section is held invalid or unenforceable under 222any particular circumstance, the balance of the section is intended to 223apply and the section as a whole is intended to apply in other 224circumstances. 225 226It is not the purpose of this section to induce you to infringe any 227patents or other property right claims or to contest validity of any 228such claims; this section has the sole purpose of protecting the 229integrity of the free software distribution system, which is 230implemented by public license practices. Many people have made 231generous contributions to the wide range of software distributed 232through that system in reliance on consistent application of that 233system; it is up to the author/donor to decide if he or she is willing 234to distribute software through any other system and a licensee cannot 235impose that choice. 236 237This section is intended to make thoroughly clear what is believed to 238be a consequence of the rest of this License. 239 240--------------------------------------------------------------------- 241 242 8. If the distribution and/or use of the Program is restricted in 243certain countries either by patents or by copyrighted interfaces, the 244original copyright holder who places the Program under this License 245may add an explicit geographical distribution limitation excluding 246those countries, so that distribution is permitted only in or among 247countries not thus excluded. In such case, this License incorporates 248the limitation as if written in the body of this License. 249 250 9. The Free Software Foundation may publish revised and/or new versions 251of the General Public License from time to time. Such new versions will 252be similar in spirit to the present version, but may differ in detail to 253address new problems or concerns. 254 255Each version is given a distinguishing version number. If the Program 256specifies a version number of this License which applies to it and "any 257later version", you have the option of following the terms and conditions 258either of that version or of any later version published by the Free 259Software Foundation. If the Program does not specify a version number of 260this License, you may choose any version ever published by the Free Software 261Foundation. 262 263 10. If you wish to incorporate parts of the Program into other free 264programs whose distribution conditions are different, write to the author 265to ask for permission. For software which is copyrighted by the Free 266Software Foundation, write to the Free Software Foundation; we sometimes 267make exceptions for this. Our decision will be guided by the two goals 268of preserving the free status of all derivatives of our free software and 269of promoting the sharing and reuse of software generally. 270 271 NO WARRANTY 272 273 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 274FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 275OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 276PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 277OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 278MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 279TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 280PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 281REPAIR OR CORRECTION. 282 283 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 284WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 285REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 286INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 287OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 288TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 289YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 290PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 291POSSIBILITY OF SUCH DAMAGES. 292 293 END OF TERMS AND CONDITIONS 294