1 GNU GENERAL PUBLIC LICENSE 2 Version 2, June 1991 3 4 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 5 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 6 Everyone is permitted to copy and distribute verbatim copies 7 of this license document, but changing it is not allowed. 8 9 Preamble 10 11 The licenses for most software are designed to take away your 12freedom to share and change it. By contrast, the GNU General Public 13License is intended to guarantee your freedom to share and change free 14software--to make sure the software is free for all its users. This 15General Public License applies to most of the Free Software 16Foundation's software and to any other program whose authors commit to 17using it. (Some other Free Software Foundation software is covered by 18the GNU Library General Public License instead.) You can apply it to 19your programs, too. 20 21 When we speak of free software, we are referring to freedom, not 22price. Our General Public Licenses are designed to make sure that you 23have the freedom to distribute copies of free software (and charge for 24this service if you wish), that you receive source code or can get it 25if you want it, that you can change the software or use pieces of it 26in new free programs; and that you know you can do these things. 27 28 To protect your rights, we need to make restrictions that forbid 29anyone to deny you these rights or to ask you to surrender the rights. 30These restrictions translate to certain responsibilities for you if you 31distribute copies of the software, or if you modify it. 32 33 For example, if you distribute copies of such a program, whether 34gratis or for a fee, you must give the recipients all the rights that 35you have. You must make sure that they, too, receive or can get the 36source code. And you must show them these terms so they know their 37rights. 38 39 We protect your rights with two steps: (1) copyright the software, and 40(2) offer you this license which gives you legal permission to copy, 41distribute and/or modify the software. 42 43 Also, for each author's protection and ours, we want to make certain 44that everyone understands that there is no warranty for this free 45software. If the software is modified by someone else and passed on, we 46want its recipients to know that what they have is not the original, so 47that any problems introduced by others will not reflect on the original 48authors' reputations. 49 50 Finally, any free program is threatened constantly by software 51patents. We wish to avoid the danger that redistributors of a free 52program will individually obtain patent licenses, in effect making the 53program proprietary. To prevent this, we have made it clear that any 54patent must be licensed for everyone's free use or not licensed at all. 55 56 The precise terms and conditions for copying, distribution and 57modification follow. 58 59 GNU GENERAL PUBLIC LICENSE 60 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 61 62 0. This License applies to any program or other work which contains 63a notice placed by the copyright holder saying it may be distributed 64under the terms of this General Public License. The "Program", below, 65refers to any such program or work, and a "work based on the Program" 66means either the Program or any derivative work under copyright law: 67that is to say, a work containing the Program or a portion of it, 68either verbatim or with modifications and/or translated into another 69language. (Hereinafter, translation is included without limitation in 70the term "modification".) Each licensee is addressed as "you". 71 72Activities other than copying, distribution and modification are not 73covered by this License; they are outside its scope. The act of 74running the Program is not restricted, and the output from the Program 75is covered only if its contents constitute a work based on the 76Program (independent of having been made by running the Program). 77Whether that is true depends on what the Program does. 78 79 1. You may copy and distribute verbatim copies of the Program's 80source code as you receive it, in any medium, provided that you 81conspicuously and appropriately publish on each copy an appropriate 82copyright notice and disclaimer of warranty; keep intact all the 83notices that refer to this License and to the absence of any warranty; 84and give any other recipients of the Program a copy of this License 85along with the Program. 86 87You may charge a fee for the physical act of transferring a copy, and 88you may at your option offer warranty protection in exchange for a fee. 89 90 2. You may modify your copy or copies of the Program or any portion 91of it, thus forming a work based on the Program, and copy and 92distribute such modifications or work under the terms of Section 1 93above, provided that you also meet all of these conditions: 94 95 a) You must cause the modified files to carry prominent notices 96 stating that you changed the files and the date of any change. 97 98 b) You must cause any work that you distribute or publish, that in 99 whole or in part contains or is derived from the Program or any 100 part thereof, to be licensed as a whole at no charge to all third 101 parties under the terms of this License. 102 103 c) If the modified program normally reads commands interactively 104 when run, you must cause it, when started running for such 105 interactive use in the most ordinary way, to print or display an 106 announcement including an appropriate copyright notice and a 107 notice that there is no warranty (or else, saying that you provide 108 a warranty) and that users may redistribute the program under 109 these conditions, and telling the user how to view a copy of this 110 License. (Exception: if the Program itself is interactive but 111 does not normally print such an announcement, your work based on 112 the Program is not required to print an announcement.) 113 114These requirements apply to the modified work as a whole. If 115identifiable sections of that work are not derived from the Program, 116and can be reasonably considered independent and separate works in 117themselves, then this License, and its terms, do not apply to those 118sections when you distribute them as separate works. But when you 119distribute the same sections as part of a whole which is a work based 120on the Program, the distribution of the whole must be on the terms of 121this License, whose permissions for other licensees extend to the 122entire whole, and thus to each and every part regardless of who wrote it. 123 124Thus, it is not the intent of this section to claim rights or contest 125your rights to work written entirely by you; rather, the intent is to 126exercise the right to control the distribution of derivative or 127collective works based on the Program. 128 129In addition, mere aggregation of another work not based on the Program 130with the Program (or with a work based on the Program) on a volume of 131a storage or distribution medium does not bring the other work under 132the scope of this License. 133 134 3. You may copy and distribute the Program (or a work based on it, 135under Section 2) in object code or executable form under the terms of 136Sections 1 and 2 above provided that you also do one of the following: 137 138 a) Accompany it with the complete corresponding machine-readable 139 source code, which must be distributed under the terms of Sections 140 1 and 2 above on a medium customarily used for software 141 interchange; or, 142 143 b) Accompany it with a written offer, valid for at least three 144 years, to give any third party, for a charge no more than your 145 cost of physically performing source distribution, a complete 146 machine-readable copy of the corresponding source code, to be 147 distributed under the terms of Sections 1 and 2 above on a medium 148 customarily used for software interchange; or, 149 150 c) Accompany it with the information you received as to the offer 151 to distribute corresponding source code. (This alternative is 152 allowed only for noncommercial distribution and only if you 153 received the program in object code or executable form with such 154 an offer, in accord with Subsection b above.) 155 156The source code for a work means the preferred form of the work for 157making modifications to it. For an executable work, complete source 158code means all the source code for all modules it contains, plus any 159associated interface definition files, plus the scripts used to 160control compilation and installation of the executable. However, as a 161special exception, the source code distributed need not include 162anything that is normally distributed (in either source or binary 163form) with the major components (compiler, kernel, and so on) of the 164operating system on which the executable runs, unless that component 165itself accompanies the executable. 166 167If distribution of executable or object code is made by offering 168access to copy from a designated place, then offering equivalent 169access to copy the source code from the same place counts as 170distribution of the source code, even though third parties are not 171compelled to copy the source along with the object code. 172 173 4. You may not copy, modify, sublicense, or distribute the Program 174except as expressly provided under this License. Any attempt 175otherwise to copy, modify, sublicense or distribute the Program is 176void, and will automatically terminate your rights under this License. 177However, parties who have received copies, or rights, from you under 178this License will not have their licenses terminated so long as such 179parties remain in full compliance. 180 181 5. You are not required to accept this License, since you have not 182signed it. However, nothing else grants you permission to modify or 183distribute the Program or its derivative works. These actions are 184prohibited by law if you do not accept this License. Therefore, by 185modifying or distributing the Program (or any work based on the 186Program), you indicate your acceptance of this License to do so, and 187all its terms and conditions for copying, distributing or modifying 188the Program or works based on it. 189 190 6. Each time you redistribute the Program (or any work based on the 191Program), the recipient automatically receives a license from the 192original licensor to copy, distribute or modify the Program subject to 193these terms and conditions. You may not impose any further 194restrictions on the recipients' exercise of the rights granted herein. 195You are not responsible for enforcing compliance by third parties to 196this License. 197 198 7. If, as a consequence of a court judgment or allegation of patent 199infringement or for any other reason (not limited to patent issues), 200conditions are imposed on you (whether by court order, agreement or 201otherwise) that contradict the conditions of this License, they do not 202excuse you from the conditions of this License. If you cannot 203distribute so as to satisfy simultaneously your obligations under this 204License and any other pertinent obligations, then as a consequence you 205may not distribute the Program at all. For example, if a patent 206license would not permit royalty-free redistribution of the Program by 207all those who receive copies directly or indirectly through you, then 208the only way you could satisfy both it and this License would be to 209refrain entirely from distribution of the Program. 210 211If any portion of this section is held invalid or unenforceable under 212any particular circumstance, the balance of the section is intended to 213apply and the section as a whole is intended to apply in other 214circumstances. 215 216It is not the purpose of this section to induce you to infringe any 217patents or other property right claims or to contest validity of any 218such claims; this section has the sole purpose of protecting the 219integrity of the free software distribution system, which is 220implemented by public license practices. Many people have made 221generous contributions to the wide range of software distributed 222through that system in reliance on consistent application of that 223system; it is up to the author/donor to decide if he or she is willing 224to distribute software through any other system and a licensee cannot 225impose that choice. 226 227This section is intended to make thoroughly clear what is believed to 228be a consequence of the rest of this License. 229 230 8. If the distribution and/or use of the Program is restricted in 231certain countries either by patents or by copyrighted interfaces, the 232original copyright holder who places the Program under this License 233may add an explicit geographical distribution limitation excluding 234those countries, so that distribution is permitted only in or among 235countries not thus excluded. In such case, this License incorporates 236the limitation as if written in the body of this License. 237 238 9. The Free Software Foundation may publish revised and/or new versions 239of the General Public License from time to time. Such new versions will 240be similar in spirit to the present version, but may differ in detail to 241address new problems or concerns. 242 243Each version is given a distinguishing version number. If the Program 244specifies a version number of this License which applies to it and 245"any later version", you have the option of following the terms and 246conditions either of that version or of any later version published by 247the Free Software Foundation. If the Program does not specify a 248version number of this License, you may choose any version ever 249published by the Free Software Foundation. 250 251 10. If you wish to incorporate parts of the Program into other free 252programs whose distribution conditions are different, write to the author 253to ask for permission. For software which is copyrighted by the Free 254Software Foundation, write to the Free Software Foundation; we sometimes 255make exceptions for this. Our decision will be guided by the two goals 256of preserving the free status of all derivatives of our free software and 257of promoting the sharing and reuse of software generally. 258 259 NO WARRANTY 260 261 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO 262WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. 263EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR 264OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY 265KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE 266IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 267PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE 268PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 269THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 270 271 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN 272WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY 273AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU 274FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR 275CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE 276PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING 277RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A 278FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF 279SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 280DAMAGES. 281 282 END OF TERMS AND CONDITIONS