Martin Roth | 480d927 | 2019-10-27 14:58:32 -0600 | [diff] [blame] | 1 | GNU GENERAL PUBLIC LICENSE |
| 2 | |
| 3 | Version 2, June 1991 |
| 4 | |
Martin Roth | 5c73413 | 2021-02-14 13:52:00 -0700 | [diff] [blame^] | 5 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. |
Martin Roth | 480d927 | 2019-10-27 14:58:32 -0600 | [diff] [blame] | 6 | |
| 7 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA |
| 8 | |
| 9 | Everyone is permitted to copy and distribute verbatim copies of this license |
| 10 | document, but changing it is not allowed. |
| 11 | |
| 12 | Preamble |
| 13 | |
| 14 | The licenses for most software are designed to take away your freedom to share |
| 15 | and change it. By contrast, the GNU General Public License is intended to |
| 16 | guarantee your freedom to share and change free software--to make sure the |
| 17 | software is free for all its users. This General Public License applies to |
| 18 | most of the Free Software Foundation's software and to any other program whose |
| 19 | authors commit to using it. (Some other Free Software Foundation software |
| 20 | is covered by the GNU Lesser General Public License instead.) You can apply |
| 21 | it to your programs, too. |
| 22 | |
| 23 | When we speak of free software, we are referring to freedom, not price. Our |
| 24 | General Public Licenses are designed to make sure that you have the freedom |
| 25 | to distribute copies of free software (and charge for this service if you |
| 26 | wish), that you receive source code or can get it if you want it, that you |
| 27 | can change the software or use pieces of it in new free programs; and that |
| 28 | you know you can do these things. |
| 29 | |
| 30 | To protect your rights, we need to make restrictions that forbid anyone to |
| 31 | deny you these rights or to ask you to surrender the rights. These restrictions |
| 32 | translate to certain responsibilities for you if you distribute copies of |
| 33 | the software, or if you modify it. |
| 34 | |
| 35 | For example, if you distribute copies of such a program, whether gratis or |
| 36 | for a fee, you must give the recipients all the rights that you have. You |
| 37 | must make sure that they, too, receive or can get the source code. And you |
| 38 | must show them these terms so they know their rights. |
| 39 | |
| 40 | We protect your rights with two steps: (1) copyright the software, and (2) |
| 41 | offer you this license which gives you legal permission to copy, distribute |
| 42 | and/or modify the software. |
| 43 | |
| 44 | Also, for each author's protection and ours, we want to make certain that |
| 45 | everyone understands that there is no warranty for this free software. If |
| 46 | the software is modified by someone else and passed on, we want its recipients |
| 47 | to know that what they have is not the original, so that any problems introduced |
| 48 | by others will not reflect on the original authors' reputations. |
| 49 | |
| 50 | Finally, any free program is threatened constantly by software patents. We |
| 51 | wish to avoid the danger that redistributors of a free program will individually |
| 52 | obtain patent licenses, in effect making the program proprietary. To prevent |
| 53 | this, we have made it clear that any patent must be licensed for everyone's |
| 54 | free use or not licensed at all. |
| 55 | |
| 56 | The precise terms and conditions for copying, distribution and modification |
| 57 | follow. |
| 58 | |
| 59 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION |
| 60 | |
| 61 | 0. This License applies to any program or other work which contains a notice |
| 62 | placed by the copyright holder saying it may be distributed under the terms |
| 63 | of this General Public License. The "Program", below, refers to any such program |
| 64 | or work, and a "work based on the Program" means either the Program or any |
| 65 | derivative work under copyright law: that is to say, a work containing the |
| 66 | Program or a portion of it, either verbatim or with modifications and/or translated |
| 67 | into another language. (Hereinafter, translation is included without limitation |
| 68 | in the term "modification".) Each licensee is addressed as "you". |
| 69 | |
| 70 | Activities other than copying, distribution and modification are not covered |
| 71 | by this License; they are outside its scope. The act of running the Program |
| 72 | is not restricted, and the output from the Program is covered only if its |
| 73 | contents constitute a work based on the Program (independent of having been |
| 74 | made by running the Program). Whether that is true depends on what the Program |
| 75 | does. |
| 76 | |
| 77 | 1. You may copy and distribute verbatim copies of the Program's source code |
| 78 | as you receive it, in any medium, provided that you conspicuously and appropriately |
| 79 | publish on each copy an appropriate copyright notice and disclaimer of warranty; |
| 80 | keep intact all the notices that refer to this License and to the absence |
| 81 | of any warranty; and give any other recipients of the Program a copy of this |
| 82 | License along with the Program. |
| 83 | |
| 84 | You may charge a fee for the physical act of transferring a copy, and you |
| 85 | may at your option offer warranty protection in exchange for a fee. |
| 86 | |
| 87 | 2. You may modify your copy or copies of the Program or any portion of it, |
| 88 | thus forming a work based on the Program, and copy and distribute such modifications |
| 89 | or work under the terms of Section 1 above, provided that you also meet all |
| 90 | of these conditions: |
| 91 | |
| 92 | a) You must cause the modified files to carry prominent notices stating that |
| 93 | 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 whole or |
| 96 | in part contains or is derived from the Program or any part thereof, to be |
| 97 | licensed as a whole at no charge to all third parties under the terms of this |
| 98 | License. |
| 99 | |
| 100 | c) If the modified program normally reads commands interactively when run, |
| 101 | you must cause it, when started running for such interactive use in the most |
| 102 | ordinary way, to print or display an announcement including an appropriate |
| 103 | copyright notice and a notice that there is no warranty (or else, saying that |
| 104 | you provide a warranty) and that users may redistribute the program under |
| 105 | these conditions, and telling the user how to view a copy of this License. |
| 106 | (Exception: if the Program itself is interactive but does not normally print |
| 107 | such an announcement, your work based on the Program is not required to print |
| 108 | an announcement.) |
| 109 | |
| 110 | These requirements apply to the modified work as a whole. If identifiable |
| 111 | sections of that work are not derived from the Program, and can be reasonably |
| 112 | considered independent and separate works in themselves, then this License, |
| 113 | and its terms, do not apply to those sections when you distribute them as |
| 114 | separate works. But when you distribute the same sections as part of a whole |
| 115 | which is a work based on the Program, the distribution of the whole must be |
| 116 | on the terms of this License, whose permissions for other licensees extend |
| 117 | to the entire whole, and thus to each and every part regardless of who wrote |
| 118 | it. |
| 119 | |
| 120 | Thus, it is not the intent of this section to claim rights or contest your |
| 121 | rights to work written entirely by you; rather, the intent is to exercise |
| 122 | the right to control the distribution of derivative or collective works based |
| 123 | on the Program. |
| 124 | |
| 125 | In addition, mere aggregation of another work not based on the Program with |
| 126 | the Program (or with a work based on the Program) on a volume of a storage |
| 127 | or distribution medium does not bring the other work under the scope of this |
| 128 | License. |
| 129 | |
| 130 | 3. You may copy and distribute the Program (or a work based on it, under Section |
| 131 | 2) in object code or executable form under the terms of Sections 1 and 2 above |
| 132 | provided that you also do one of the following: |
| 133 | |
| 134 | a) Accompany it with the complete corresponding machine-readable source code, |
| 135 | which must be distributed under the terms of Sections 1 and 2 above on a medium |
| 136 | customarily used for software interchange; or, |
| 137 | |
| 138 | b) Accompany it with a written offer, valid for at least three years, to give |
| 139 | any third party, for a charge no more than your cost of physically performing |
| 140 | source distribution, a complete machine-readable copy of the corresponding |
| 141 | source code, to be distributed under the terms of Sections 1 and 2 above on |
| 142 | a medium customarily used for software interchange; or, |
| 143 | |
| 144 | c) Accompany it with the information you received as to the offer to distribute |
| 145 | corresponding source code. (This alternative is allowed only for noncommercial |
| 146 | distribution and only if you received the program in object code or executable |
| 147 | form with such an offer, in accord with Subsection b above.) |
| 148 | |
| 149 | The source code for a work means the preferred form of the work for making |
| 150 | modifications to it. For an executable work, complete source code means all |
| 151 | the source code for all modules it contains, plus any associated interface |
| 152 | definition files, plus the scripts used to control compilation and installation |
| 153 | of the executable. However, as a special exception, the source code distributed |
| 154 | need not include anything that is normally distributed (in either source or |
| 155 | binary form) with the major components (compiler, kernel, and so on) of the |
| 156 | operating system on which the executable runs, unless that component itself |
| 157 | accompanies the executable. |
| 158 | |
| 159 | If distribution of executable or object code is made by offering access to |
| 160 | copy from a designated place, then offering equivalent access to copy the |
| 161 | source code from the same place counts as distribution of the source code, |
| 162 | even though third parties are not compelled to copy the source along with |
| 163 | the object code. |
| 164 | |
| 165 | 4. You may not copy, modify, sublicense, or distribute the Program except |
| 166 | as expressly provided under this License. Any attempt otherwise to copy, modify, |
| 167 | sublicense or distribute the Program is void, and will automatically terminate |
| 168 | your rights under this License. However, parties who have received copies, |
| 169 | or rights, from you under this License will not have their licenses terminated |
| 170 | so long as such parties remain in full compliance. |
| 171 | |
| 172 | 5. You are not required to accept this License, since you have not signed |
| 173 | it. However, nothing else grants you permission to modify or distribute the |
| 174 | Program or its derivative works. These actions are prohibited by law if you |
| 175 | do not accept this License. Therefore, by modifying or distributing the Program |
| 176 | (or any work based on the Program), you indicate your acceptance of this License |
| 177 | to do so, and all its terms and conditions for copying, distributing or modifying |
| 178 | the Program or works based on it. |
| 179 | |
| 180 | 6. Each time you redistribute the Program (or any work based on the Program), |
| 181 | the recipient automatically receives a license from the original licensor |
| 182 | to copy, distribute or modify the Program subject to these terms and conditions. |
| 183 | You may not impose any further restrictions on the recipients' exercise of |
| 184 | the rights granted herein. You are not responsible for enforcing compliance |
| 185 | by third parties to this License. |
| 186 | |
| 187 | 7. If, as a consequence of a court judgment or allegation of patent infringement |
| 188 | or for any other reason (not limited to patent issues), conditions are imposed |
| 189 | on you (whether by court order, agreement or otherwise) that contradict the |
| 190 | conditions of this License, they do not excuse you from the conditions of |
| 191 | this License. If you cannot distribute so as to satisfy simultaneously your |
| 192 | obligations under this License and any other pertinent obligations, then as |
| 193 | a consequence you may not distribute the Program at all. For example, if a |
| 194 | patent license would not permit royalty-free redistribution of the Program |
| 195 | by all those who receive copies directly or indirectly through you, then the |
| 196 | only way you could satisfy both it and this License would be to refrain entirely |
| 197 | from distribution of the Program. |
| 198 | |
| 199 | If any portion of this section is held invalid or unenforceable under any |
| 200 | particular circumstance, the balance of the section is intended to apply and |
| 201 | the section as a whole is intended to apply in other circumstances. |
| 202 | |
| 203 | It is not the purpose of this section to induce you to infringe any patents |
| 204 | or other property right claims or to contest validity of any such claims; |
| 205 | this section has the sole purpose of protecting the integrity of the free |
| 206 | software distribution system, which is implemented by public license practices. |
| 207 | Many people have made generous contributions to the wide range of software |
| 208 | distributed through that system in reliance on consistent application of that |
| 209 | system; it is up to the author/donor to decide if he or she is willing to |
| 210 | distribute software through any other system and a licensee cannot impose |
| 211 | that choice. |
| 212 | |
| 213 | This section is intended to make thoroughly clear what is believed to be a |
| 214 | consequence of the rest of this License. |
| 215 | |
| 216 | 8. If the distribution and/or use of the Program is restricted in certain |
| 217 | countries either by patents or by copyrighted interfaces, the original copyright |
| 218 | holder who places the Program under this License may add an explicit geographical |
| 219 | distribution limitation excluding those countries, so that distribution is |
| 220 | permitted only in or among countries not thus excluded. In such case, this |
| 221 | License incorporates the limitation as if written in the body of this License. |
| 222 | |
| 223 | 9. The Free Software Foundation may publish revised and/or new versions of |
| 224 | the General Public License from time to time. Such new versions will be similar |
| 225 | in spirit to the present version, but may differ in detail to address new |
| 226 | problems or concerns. |
| 227 | |
| 228 | Each version is given a distinguishing version number. If the Program specifies |
| 229 | a version number of this License which applies to it and "any later version", |
| 230 | you have the option of following the terms and conditions either of that version |
| 231 | or of any later version published by the Free Software Foundation. If the |
| 232 | Program does not specify a version number of this License, you may choose |
| 233 | any version ever published by the Free Software Foundation. |
| 234 | |
| 235 | 10. If you wish to incorporate parts of the Program into other free programs |
| 236 | whose distribution conditions are different, write to the author to ask for |
| 237 | permission. For software which is copyrighted by the Free Software Foundation, |
| 238 | write to the Free Software Foundation; we sometimes make exceptions for this. |
| 239 | Our decision will be guided by the two goals of preserving the free status |
| 240 | of all derivatives of our free software and of promoting the sharing and reuse |
| 241 | of software generally. |
| 242 | |
| 243 | NO WARRANTY |
| 244 | |
| 245 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR |
| 246 | THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE |
| 247 | STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM |
| 248 | "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, |
| 249 | BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 250 | FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE |
| 251 | OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME |
| 252 | THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
| 253 | |
| 254 | 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
| 255 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE |
| 256 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY |
| 257 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE |
| 258 | OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA |
| 259 | OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES |
| 260 | OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH |
| 261 | HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. |
| 262 | END OF TERMS AND CONDITIONS |
| 263 | |
| 264 | How to Apply These Terms to Your New Programs |
| 265 | |
| 266 | If you develop a new program, and you want it to be of the greatest possible |
| 267 | use to the public, the best way to achieve this is to make it free software |
| 268 | which everyone can redistribute and change under these terms. |
| 269 | |
| 270 | To do so, attach the following notices to the program. It is safest to attach |
| 271 | them to the start of each source file to most effectively convey the exclusion |
| 272 | of warranty; and each file should have at least the "copyright" line and a |
| 273 | pointer to where the full notice is found. |
| 274 | |
| 275 | <one line to give the program's name and an idea of what it does.> |
| 276 | |
| 277 | Copyright (C) <yyyy> <name of author> |
| 278 | |
| 279 | This program is free software; you can redistribute it and/or modify it under |
| 280 | the terms of the GNU General Public License as published by the Free Software |
| 281 | Foundation; either version 2 of the License, or (at your option) any later |
| 282 | version. |
| 283 | |
| 284 | This program is distributed in the hope that it will be useful, but WITHOUT |
| 285 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| 286 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
| 287 | |
| 288 | You should have received a copy of the GNU General Public License along with |
| 289 | this program; if not, write to the Free Software Foundation, Inc., 51 Franklin |
| 290 | Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 291 | |
| 292 | Also add information on how to contact you by electronic and paper mail. |
| 293 | |
| 294 | If the program is interactive, make it output a short notice like this when |
| 295 | it starts in an interactive mode: |
| 296 | |
| 297 | Gnomovision version 69, Copyright (C) year name of author Gnomovision comes |
| 298 | with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, |
| 299 | and you are welcome to redistribute it under certain conditions; type `show |
| 300 | c' for details. |
| 301 | |
| 302 | The hypothetical commands `show w' and `show c' should show the appropriate |
| 303 | parts of the General Public License. Of course, the commands you use may be |
| 304 | called something other than `show w' and `show c'; they could even be mouse-clicks |
| 305 | or menu items--whatever suits your program. |
| 306 | |
| 307 | You should also get your employer (if you work as a programmer) or your school, |
| 308 | if any, to sign a "copyright disclaimer" for the program, if necessary. Here |
| 309 | is a sample; alter the names: |
| 310 | |
| 311 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' |
| 312 | (which makes passes at compilers) written by James Hacker. |
| 313 | |
| 314 | <signature of Ty Coon>, 1 April 1989 Ty Coon, President of Vice This General |
| 315 | Public License does not permit incorporating your program into proprietary |
| 316 | programs. If your program is a subroutine library, you may consider it more |
| 317 | useful to permit linking proprietary applications with the library. If this |
| 318 | is what you want to do, use the GNU Lesser General Public License instead |
| 319 | of this License. |