1Copyright (C) 1989, 1991 Free Software Foundation, Inc. 259 Temple Place, Suite 330, Boston, MA 02111-1307 USA 3 4Everyone is permitted to copy and distribute verbatim copies 5of this license document, but changing it is not allowed. 6 7Preamble 8 9The licenses for most software are designed to take away your 10freedom to share and change it. By contrast, the GNU General Public 11License is intended to guarantee your freedom to share and change free 12software--to make sure the software is free for all its users. This 13General Public License applies to most of the Free Software 14Foundation's software and to any other program whose authors commit to 15using it. (Some other Free Software Foundation software is covered by 16the GNU Library General Public License instead.) You can apply it to 17your programs, too. 18 19When we speak of free software, we are referring to freedom, not 20price. Our General Public Licenses are designed to make sure that you 21have the freedom to distribute copies of free software (and charge for 22this service if you wish), that you receive source code or can get it 23if you want it, that you can change the software or use pieces of it 24in new free programs; and that you know you can do these things. 25 26To protect your rights, we need to make restrictions that forbid 27anyone to deny you these rights or to ask you to surrender the rights. 28These restrictions translate to certain responsibilities for you if you 29distribute copies of the software, or if you modify it. 30 31For example, if you distribute copies of such a program, whether 32gratis or for a fee, you must give the recipients all the rights that 33you have. You must make sure that they, too, receive or can get the 34source code. And you must show them these terms so they know their 35rights. 36 37We protect your rights with two steps: (1) copyright the software, and 38(2) offer you this license which gives you legal permission to copy, 39distribute and/or modify the software. 40 41Also, for each author's protection and ours, we want to make certain 42that everyone understands that there is no warranty for this free 43software. If the software is modified by someone else and passed on, we 44want its recipients to know that what they have is not the original, so 45that any problems introduced by others will not reflect on the original 46authors' reputations. 47 48Finally, any free program is threatened constantly by software 49patents. We wish to avoid the danger that redistributors of a free 50program will individually obtain patent licenses, in effect making the 51program proprietary. To prevent this, we have made it clear that any 52patent must be licensed for everyone's free use or not licensed at all. 53 54The precise terms and conditions for copying, distribution and 55modification follow. 56 57TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 58 590. This License applies to any program or other work which contains 60a notice placed by the copyright holder saying it may be distributed 61under the terms of this General Public License. The "Program", below, 62refers to any such program or work, and a "work based on the Program" 63means either the Program or any derivative work under copyright law: 64that is to say, a work containing the Program or a portion of it, 65either verbatim or with modifications and/or translated into another 66language. (Hereinafter, translation is included without limitation in 67the term "modification".) Each licensee is addressed as "you". 68 69Activities other than copying, distribution and modification are not 70covered by this License; they are outside its scope. The act of 71running the Program is not restricted, and the output from the Program 72is covered only if its contents constitute a work based on the 73Program (independent of having been made by running the Program). 74Whether that is true depends on what the Program does. 75 761. You may copy and distribute verbatim copies of the Program's 77source code as you receive it, in any medium, provided that you 78conspicuously and appropriately publish on each copy an appropriate 79copyright notice and disclaimer of warranty; keep intact all the 80notices that refer to this License and to the absence of any warranty; 81and give any other recipients of the Program a copy of this License 82along with the Program. 83 84You may charge a fee for the physical act of transferring a copy, and 85you may at your option offer warranty protection in exchange for a fee. 86 872. You may modify your copy or copies of the Program or any portion 88of it, thus forming a work based on the Program, and copy and 89distribute such modifications or work under the terms of Section 1 90above, provided that you also meet all of these conditions: 91 92 a) You must cause the modified files to carry prominent notices 93 stating 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 96 whole or in part contains or is derived from the Program or any 97 part thereof, to be licensed as a whole at no charge to all third 98 parties under the terms of this License. 99 100 c) If the modified program normally reads commands interactively 101 when run, you must cause it, when started running for such 102 interactive use in the most ordinary way, to print or display an 103 announcement including an appropriate copyright notice and a 104 notice that there is no warranty (or else, saying that you provide 105 a warranty) and that users may redistribute the program under 106 these conditions, and telling the user how to view a copy of this 107 License. (Exception: if the Program itself is interactive but 108 does not normally print such an announcement, your work based on 109 the Program is not required to print an announcement.) 110 111These requirements apply to the modified work as a whole. If 112identifiable sections of that work are not derived from the Program, 113and can be reasonably considered independent and separate works in 114themselves, then this License, and its terms, do not apply to those 115sections when you distribute them as separate works. But when you 116distribute the same sections as part of a whole which is a work based 117on the Program, the distribution of the whole must be on the terms of 118this License, whose permissions for other licensees extend to the 119entire whole, and thus to each and every part regardless of who wrote it. 120 121Thus, it is not the intent of this section to claim rights or contest 122your rights to work written entirely by you; rather, the intent is to 123exercise the right to control the distribution of derivative or 124collective works based on the Program. 125 126In addition, mere aggregation of another work not based on the Program 127with the Program (or with a work based on the Program) on a volume of 128a storage or distribution medium does not bring the other work under 129the scope of this License. 130 1313. You may copy and distribute the Program (or a work based on it, 132under Section 2) in object code or executable form under the terms of 133Sections 1 and 2 above provided that you also do one of the following: 134 135 a) Accompany it with the complete corresponding machine-readable 136 source code, which must be distributed under the terms of Sections 137 1 and 2 above on a medium customarily used for software interchange; or, 138 139 b) Accompany it with a written offer, valid for at least three 140 years, to give any third party, for a charge no more than your 141 cost of physically performing source distribution, a complete 142 machine-readable copy of the corresponding source code, to be 143 distributed under the terms of Sections 1 and 2 above on a medium 144 customarily used for software interchange; or, 145 146 c) Accompany it with the information you received as to the offer 147 to distribute corresponding source code. (This alternative is 148 allowed only for noncommercial distribution and only if you 149 received the program in object code or executable form with such 150 an offer, in accord with Subsection b above.) 151 152The source code for a work means the preferred form of the work for 153making modifications to it. For an executable work, complete source 154code means all the source code for all modules it contains, plus any 155associated interface definition files, plus the scripts used to 156control compilation and installation of the executable. However, as a 157special exception, the source code distributed need not include 158anything that is normally distributed (in either source or binary 159form) with the major components (compiler, kernel, and so on) of the 160operating system on which the executable runs, unless that component 161itself accompanies the executable. 162 163If distribution of executable or object code is made by offering 164access to copy from a designated place, then offering equivalent 165access to copy the source code from the same place counts as 166distribution of the source code, even though third parties are not 167compelled to copy the source along with the object code. 168 1694. You may not copy, modify, sublicense, or distribute the Program 170except as expressly provided under this License. Any attempt 171otherwise to copy, modify, sublicense or distribute the Program is 172void, and will automatically terminate your rights under this License. 173However, parties who have received copies, or rights, from you under 174this License will not have their licenses terminated so long as such 175parties remain in full compliance. 176 1775. You are not required to accept this License, since you have not 178signed it. However, nothing else grants you permission to modify or 179distribute the Program or its derivative works. These actions are 180prohibited by law if you do not accept this License. Therefore, by 181modifying or distributing the Program (or any work based on the 182Program), you indicate your acceptance of this License to do so, and 183all its terms and conditions for copying, distributing or modifying 184the Program or works based on it. 185 1866. Each time you redistribute the Program (or any work based on the 187Program), the recipient automatically receives a license from the 188original licensor to copy, distribute or modify the Program subject to 189these terms and conditions. You may not impose any further 190restrictions on the recipients' exercise of the rights granted herein. 191You are not responsible for enforcing compliance by third parties to 192this License. 193 1947. If, as a consequence of a court judgment or allegation of patent 195infringement or for any other reason (not limited to patent issues), 196conditions are imposed on you (whether by court order, agreement or 197otherwise) that contradict the conditions of this License, they do not 198excuse you from the conditions of this License. If you cannot 199distribute so as to satisfy simultaneously your obligations under this 200License and any other pertinent obligations, then as a consequence you 201may not distribute the Program at all. For example, if a patent 202license would not permit royalty-free redistribution of the Program by 203all those who receive copies directly or indirectly through you, then 204the only way you could satisfy both it and this License would be to 205refrain entirely from distribution of the Program. 206 207If any portion of this section is held invalid or unenforceable under 208any particular circumstance, the balance of the section is intended to 209apply and the section as a whole is intended to apply in other 210circumstances. 211 212It is not the purpose of this section to induce you to infringe any 213patents or other property right claims or to contest validity of any 214such claims; this section has the sole purpose of protecting the 215integrity of the free software distribution system, which is 216implemented by public license practices. Many people have made 217generous contributions to the wide range of software distributed 218through that system in reliance on consistent application of that 219system; it is up to the author/donor to decide if he or she is willing 220to distribute software through any other system and a licensee cannot 221impose that choice. 222 223This section is intended to make thoroughly clear what is believed to 224be a consequence of the rest of this License. 225 2268. If the distribution and/or use of the Program is restricted in 227certain countries either by patents or by copyrighted interfaces, the 228original copyright holder who places the Program under this License 229may add an explicit geographical distribution limitation excluding 230those countries, so that distribution is permitted only in or among 231countries not thus excluded. In such case, this License incorporates 232the limitation as if written in the body of this License. 233 2349. The Free Software Foundation may publish revised and/or new versions 235of the General Public License from time to time. Such new versions will 236be similar in spirit to the present version, but may differ in detail to 237address new problems or concerns. 238 239Each version is given a distinguishing version number. If the Program 240specifies a version number of this License which applies to it and "any 241later version", you have the option of following the terms and conditions 242either of that version or of any later version published by the Free 243Software Foundation. If the Program does not specify a version number of 244this License, you may choose any version ever published by the Free Software 245Foundation. 246 24710. If you wish to incorporate parts of the Program into other free 248programs whose distribution conditions are different, write to the author 249to ask for permission. For software which is copyrighted by the Free 250Software Foundation, write to the Free Software Foundation; we sometimes 251make exceptions for this. Our decision will be guided by the two goals 252of preserving the free status of all derivatives of our free software and 253of promoting the sharing and reuse of software generally. 254 255NO WARRANTY 256 25711. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 258FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 259OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 260PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 261OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 262MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 263TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 264PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 265REPAIR OR CORRECTION. 266 26712. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 268WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 269REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 270INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 271OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 272TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 273YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 274PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 275POSSIBILITY OF SUCH DAMAGES. 276 277END OF TERMS AND CONDITIONS 278