1 2 GNU GENERAL PUBLIC LICENSE 3 Version 1, February 1989 4 5 Copyright (C) 1989 Free Software Foundation, Inc. 6 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 7 8 Everyone is permitted to copy and distribute verbatim copies 9 of this license document, but changing it is not allowed. 10 11 Preamble 12 13 The license agreements of most software companies try to keep users 14at the mercy of those companies. By contrast, our General Public 15License is intended to guarantee your freedom to share and change free 16software--to make sure the software is free for all its users. The 17General Public License applies to the Free Software Foundation's 18software and to any other program whose authors commit to using it. 19You can use it for your programs, too. 20 21 When we speak of free software, we are referring to freedom, not 22price. Specifically, the General Public License is designed to make 23sure that you have the freedom to give away or sell copies of free 24software, that you receive source code or can get it if you want it, 25that you can change the software or use pieces of it in new free 26programs; 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 a 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 tell them their rights. 37 38 We protect your rights with two steps: (1) copyright the software, and 39(2) offer you this license which gives you legal permission to copy, 40distribute and/or modify the software. 41 42 Also, for each author's protection and ours, we want to make certain 43that everyone understands that there is no warranty for this free 44software. If the software is modified by someone else and passed on, we 45want its recipients to know that what they have is not the original, so 46that any problems introduced by others will not reflect on the original 47authors' reputations. 48 49 The precise terms and conditions for copying, distribution and 50modification follow. 51 52 GNU GENERAL PUBLIC LICENSE 53 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 54 55 0. This License Agreement applies to any program or other work which 56contains a notice placed by the copyright holder saying it may be 57distributed under the terms of this General Public License. The 58"Program", below, refers to any such program or work, and a "work based 59on the Program" means either the Program or any work containing the 60Program or a portion of it, either verbatim or with modifications. Each 61licensee is addressed as "you". 62 63 1. You may copy and distribute verbatim copies of the Program's source 64code as you receive it, in any medium, provided that you conspicuously and 65appropriately publish on each copy an appropriate copyright notice and 66disclaimer of warranty; keep intact all the notices that refer to this 67General Public License and to the absence of any warranty; and give any 68other recipients of the Program a copy of this General Public License 69along with the Program. You may charge a fee for the physical act of 70transferring a copy. 71 72 2. You may modify your copy or copies of the Program or any portion of 73it, and copy and distribute such modifications under the terms of Paragraph 741 above, provided that you also do the following: 75 76 a) cause the modified files to carry prominent notices stating that 77 you changed the files and the date of any change; and 78 79 b) cause the whole of any work that you distribute or publish, that 80 in whole or in part contains the Program or any part thereof, either 81 with or without modifications, to be licensed at no charge to all 82 third parties under the terms of this General Public License (except 83 that you may choose to grant warranty protection to some or all 84 third parties, at your option). 85 86 c) If the modified program normally reads commands interactively when 87 run, you must cause it, when started running for such interactive use 88 in the simplest and most usual way, to print or display an 89 announcement including an appropriate copyright notice and a notice 90 that there is no warranty (or else, saying that you provide a 91 warranty) and that users may redistribute the program under these 92 conditions, and telling the user how to view a copy of this General 93 Public License. 94 95 d) You may charge a fee for the physical act of transferring a 96 copy, and you may at your option offer warranty protection in 97 exchange for a fee. 98 99Mere aggregation of another independent work with the Program (or its 100derivative) on a volume of a storage or distribution medium does not bring 101the other work under the scope of these terms. 102 103 3. You may copy and distribute the Program (or a portion or derivative of 104it, under Paragraph 2) in object code or executable form under the terms of 105Paragraphs 1 and 2 above provided that you also do one of the following: 106 107 a) accompany it with the complete corresponding machine-readable 108 source code, which must be distributed under the terms of 109 Paragraphs 1 and 2 above; or, 110 111 b) accompany it with a written offer, valid for at least three 112 years, to give any third party free (except for a nominal charge 113 for the cost of distribution) a complete machine-readable copy of the 114 corresponding source code, to be distributed under the terms of 115 Paragraphs 1 and 2 above; or, 116 117 c) accompany it with the information you received as to where the 118 corresponding source code may be obtained. (This alternative is 119 allowed only for noncommercial distribution and only if you 120 received the program in object code or executable form alone.) 121 122Source code for a work means the preferred form of the work for making 123modifications to it. For an executable file, complete source code means 124all the source code for all modules it contains; but, as a special 125exception, it need not include source code for modules which are standard 126libraries that accompany the operating system on which the executable 127file runs, or for standard header files or definitions files that 128accompany that operating system. 129 130 4. You may not copy, modify, sublicense, distribute or transfer the 131Program except as expressly provided under this General Public License. 132Any attempt otherwise to copy, modify, sublicense, distribute or transfer 133the Program is void, and will automatically terminate your rights to use 134the Program under this License. However, parties who have received 135copies, or rights to use copies, from you under this General Public 136License will not have their licenses terminated so long as such parties 137remain in full compliance. 138 139 5. By copying, distributing or modifying the Program (or any work based 140on the Program) you indicate your acceptance of this license to do so, 141and all its terms and conditions. 142 143 6. Each time you redistribute the Program (or any work based on the 144Program), the recipient automatically receives a license from the original 145licensor to copy, distribute or modify the Program subject to these 146terms and conditions. You may not impose any further restrictions on the 147recipients' exercise of the rights granted herein. 148 149 7. The Free Software Foundation may publish revised and/or new versions 150of the General Public License from time to time. Such new versions will 151be similar in spirit to the present version, but may differ in detail to 152address new problems or concerns. 153 154Each version is given a distinguishing version number. If the Program 155specifies a version number of the license which applies to it and "any 156later version", you have the option of following the terms and conditions 157either of that version or of any later version published by the Free 158Software Foundation. If the Program does not specify a version number of 159the license, you may choose any version ever published by the Free Software 160Foundation. 161 162 8. If you wish to incorporate parts of the Program into other free 163programs whose distribution conditions are different, write to the author 164to ask for permission. For software which is copyrighted by the Free 165Software Foundation, write to the Free Software Foundation; we sometimes 166make exceptions for this. Our decision will be guided by the two goals 167of preserving the free status of all derivatives of our free software and 168of promoting the sharing and reuse of software generally. 169 170 NO WARRANTY 171 172 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 173FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 174OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 175PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 176OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 177MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 178TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 179PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 180REPAIR OR CORRECTION. 181 182 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 183WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 184REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 185INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 186OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 187TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 188YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 189PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 190POSSIBILITY OF SUCH DAMAGES. 191 192 END OF TERMS AND CONDITIONS 193 194 Appendix: How to Apply These Terms to Your New Programs 195 196 If you develop a new program, and you want it to be of the greatest 197possible use to humanity, the best way to achieve this is to make it 198free software which everyone can redistribute and change under these 199terms. 200 201 To do so, attach the following notices to the program. It is safest to 202attach them to the start of each source file to most effectively convey 203the exclusion of warranty; and each file should have at least the 204"copyright" line and a pointer to where the full notice is found. 205 206 <one line to give the program's name and a brief idea of what it does.> 207 Copyright (C) 19yy <name of author> 208 209 This program is free software; you can redistribute it and/or modify 210 it under the terms of the GNU General Public License as published by 211 the Free Software Foundation; either version 1, or (at your option) 212 any later version. 213 214 This program is distributed in the hope that it will be useful, 215 but WITHOUT ANY WARRANTY; without even the implied warranty of 216 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 217 GNU General Public License for more details. 218 219 You should have received a copy of the GNU General Public License 220 along with this program; if not, write to the Free Software 221 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA 222 223 224Also add information on how to contact you by electronic and paper mail. 225 226If the program is interactive, make it output a short notice like this 227when it starts in an interactive mode: 228 229 Gnomovision version 69, Copyright (C) 19xx name of author 230 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 231 This is free software, and you are welcome to redistribute it 232 under certain conditions; type `show c' for details. 233 234The hypothetical commands `show w' and `show c' should show the 235appropriate parts of the General Public License. Of course, the 236commands you use may be called something other than `show w' and `show 237c'; they could even be mouse-clicks or menu items--whatever suits your 238program. 239 240You should also get your employer (if you work as a programmer) or your 241school, if any, to sign a "copyright disclaimer" for the program, if 242necessary. Here a sample; alter the names: 243 244 Yoyodyne, Inc., hereby disclaims all copyright interest in the 245 program `Gnomovision' (a program to direct compilers to make passes 246 at assemblers) written by James Hacker. 247 248 <signature of Ty Coon>, 1 April 1989 249 Ty Coon, President of Vice 250 251That's all there is to it! 252