1 2 GNU GENERAL PUBLIC LICENSE 3 Version 1, February 1989 4 5 Copyright (C) 1989 Free Software Foundation, Inc. 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 license agreements of most software companies try to keep users 12 at the mercy of those companies. By contrast, our General Public 13 License is intended to guarantee your freedom to share and change free 14 software--to make sure the software is free for all its users. The 15 General Public License applies to the Free Software Foundation's 16 software and to any other program whose authors commit to using it. 17 You can use it for your programs, too. 18 19 When we speak of free software, we are referring to freedom, not 20 price. Specifically, the General Public License is designed to make 21 sure that you have the freedom to give away or sell copies of free 22 software, that you receive source code or can get it if you want it, 23 that you can change the software or use pieces of it in new free 24 programs; and that you know you can do these things. 25 26 To protect your rights, we need to make restrictions that forbid 27 anyone to deny you these rights or to ask you to surrender the rights. 28 These restrictions translate to certain responsibilities for you if you 29 distribute copies of the software, or if you modify it. 30 31 For example, if you distribute copies of a such a program, whether 32 gratis or for a fee, you must give the recipients all the rights that 33 you have. You must make sure that they, too, receive or can get the 34 source code. And you must tell them their rights. 35 36 We protect your rights with two steps: (1) copyright the software, and 37 (2) offer you this license which gives you legal permission to copy, 38 distribute and/or modify the software. 39 40 Also, for each author's protection and ours, we want to make certain 41 that everyone understands that there is no warranty for this free 42 software. If the software is modified by someone else and passed on, we 43 want its recipients to know that what they have is not the original, so 44 that any problems introduced by others will not reflect on the original 45 authors' reputations. 46 47 The precise terms and conditions for copying, distribution and 48 modification follow. 49 51 GNU GENERAL PUBLIC LICENSE 52 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 53 54 0. This License Agreement applies to any program or other work which 55 contains a notice placed by the copyright holder saying it may be 56 distributed under the terms of this General Public License. The 57 "Program", below, refers to any such program or work, and a "work based 58 on the Program" means either the Program or any work containing the 59 Program or a portion of it, either verbatim or with modifications. Each 60 licensee is addressed as "you". 61 62 1. You may copy and distribute verbatim copies of the Program's source 63 code as you receive it, in any medium, provided that you conspicuously and 64 appropriately publish on each copy an appropriate copyright notice and 65 disclaimer of warranty; keep intact all the notices that refer to this 66 General Public License and to the absence of any warranty; and give any 67 other recipients of the Program a copy of this General Public License 68 along with the Program. You may charge a fee for the physical act of 69 transferring a copy. 70 71 2. You may modify your copy or copies of the Program or any portion of 72 it, and copy and distribute such modifications under the terms of Paragraph 73 1 above, provided that you also do the following: 74 75 a) cause the modified files to carry prominent notices stating that 76 you changed the files and the date of any change; and 77 78 b) cause the whole of any work that you distribute or publish, that 79 in whole or in part contains the Program or any part thereof, either 80 with or without modifications, to be licensed at no charge to all 81 third parties under the terms of this General Public License (except 82 that you may choose to grant warranty protection to some or all 83 third parties, at your option). 84 85 c) If the modified program normally reads commands interactively when 86 run, you must cause it, when started running for such interactive use 87 in the simplest and most usual way, to print or display an 88 announcement including an appropriate copyright notice and a notice 89 that there is no warranty (or else, saying that you provide a 90 warranty) and that users may redistribute the program under these 91 conditions, and telling the user how to view a copy of this General 92 Public License. 93 94 d) You may charge a fee for the physical act of transferring a 95 copy, and you may at your option offer warranty protection in 96 exchange for a fee. 97 98 Mere aggregation of another independent work with the Program (or its 99 derivative) on a volume of a storage or distribution medium does not bring 100 the other work under the scope of these terms. 101 103 3. You may copy and distribute the Program (or a portion or derivative of 104 it, under Paragraph 2) in object code or executable form under the terms of 105 Paragraphs 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.) 121 122 Source code for a work means the preferred form of the work for making 123 modifications to it. For an executable file, complete source code means 124 all the source code for all modules it contains; but, as a special 125 exception, it need not include source code for modules which are standard 126 libraries that accompany the operating system on which the executable 127 file runs, or for standard header files or definitions files that 128 accompany that operating system. 129 130 4. You may not copy, modify, sublicense, distribute or transfer the 131 Program except as expressly provided under this General Public License. 132 Any attempt otherwise to copy, modify, sublicense, distribute or transfer 133 the Program is void, and will automatically terminate your rights to use 134 the Program under this License. However, parties who have received 135 copies, or rights to use copies, from you under this General Public 136 License will not have their licenses terminated so long as such parties 137 remain in full compliance. 138 139 5. By copying, distributing or modifying the Program (or any work based 140 on the Program) you indicate your acceptance of this license to do so, 141 and all its terms and conditions. 142 143 6. Each time you redistribute the Program (or any work based on the 144 Program), the recipient automatically receives a license from the original 145 licensor to copy, distribute or modify the Program subject to these 146 terms and conditions. You may not impose any further restrictions on the 147 recipients' exercise of the rights granted herein. 148 150 7. The Free Software Foundation may publish revised and/or new versions 151 of the General Public License from time to time. Such new versions will 152 be similar in spirit to the present version, but may differ in detail to 153 address new problems or concerns. 154 155 Each version is given a distinguishing version number. If the Program 156 specifies a version number of the license which applies to it and "any 157 later version", you have the option of following the terms and conditions 158 either of that version or of any later version published by the Free 159 Software Foundation. If the Program does not specify a version number of 160 the license, you may choose any version ever published by the Free Software 161 Foundation. 162 163 8. If you wish to incorporate parts of the Program into other free 164 programs whose distribution conditions are different, write to the author 165 to ask for permission. For software which is copyrighted by the Free 166 Software Foundation, write to the Free Software Foundation; we sometimes 167 make exceptions for this. Our decision will be guided by the two goals 168 of preserving the free status of all derivatives of our free software and 169 of promoting the sharing and reuse of software generally. 170 171 NO WARRANTY 172 173 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 174 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 175 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 176 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 177 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 178 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 179 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 180 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 181 REPAIR OR CORRECTION. 182 183 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 184 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 185 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 186 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 187 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 188 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 189 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 190 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 191 POSSIBILITY OF SUCH DAMAGES. 192 193 END OF TERMS AND CONDITIONS 194 196 Appendix: How to Apply These Terms to Your New Programs 197 198 If you develop a new program, and you want it to be of the greatest 199 possible use to humanity, the best way to achieve this is to make it 200 free software which everyone can redistribute and change under these 201 terms. 202 203 To do so, attach the following notices to the program. It is safest to 204 attach them to the start of each source file to most effectively convey 205 the exclusion of warranty; and each file should have at least the 206 "copyright" line and a pointer to where the full notice is found. 207 208 <one line to give the program's name and a brief idea of what it does.> 209 Copyright (C) 19yy <name of author> 210 211 This program is free software; you can redistribute it and/or modify 212 it under the terms of the GNU General Public License as published by 213 the Free Software Foundation; either version 1, or (at your option) 214 any later version. 215 216 This program is distributed in the hope that it will be useful, 217 but WITHOUT ANY WARRANTY; without even the implied warranty of 218 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 219 GNU General Public License for more details. 220 221 You should have received a copy of the GNU General Public License 222 along with this program; if not, write to the Free Software 223 Foundation, Inc. 224 225 Also add information on how to contact you by electronic and paper mail. 226 227 If the program is interactive, make it output a short notice like this 228 when it starts in an interactive mode: 229 230 Gnomovision version 69, Copyright (C) 19xx name of author 231 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 232 This is free software, and you are welcome to redistribute it 233 under certain conditions; type `show c' for details. 234 235 The hypothetical commands `show w' and `show c' should show the 236 appropriate parts of the General Public License. Of course, the 237 commands you use may be called something other than `show w' and `show 238 c'; they could even be mouse-clicks or menu items--whatever suits your 239 program. 240 241 You should also get your employer (if you work as a programmer) or your 242 school, if any, to sign a "copyright disclaimer" for the program, if 243 necessary. Here a sample; alter the names: 244 245 Yoyodyne, Inc., hereby disclaims all copyright interest in the 246 program `Gnomovision' (a program to direct compilers to make passes 247 at assemblers) written by James Hacker. 248 249 <signature of Ty Coon>, 1 April 1989 250 Ty Coon, President of Vice 251 252 That's all there is to it! 253