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| 1 | +### GNU GENERAL PUBLIC LICENSE |
| 2 | + |
| 3 | +Version 2, June 1991 |
| 4 | + |
| 5 | + Copyright (C) 1989, 1991 Free Software Foundation, Inc. |
| 6 | + 51 Franklin Street, 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 licenses for most software are designed to take away your freedom |
| 14 | +to share and change it. By contrast, the GNU General Public License is |
| 15 | +intended to guarantee your freedom to share and change free |
| 16 | +software--to make sure the software is free for all its users. This |
| 17 | +General Public License applies to most of the Free Software |
| 18 | +Foundation's software and to any other program whose authors commit to |
| 19 | +using it. (Some other Free Software Foundation software is covered by |
| 20 | +the GNU Lesser General Public License instead.) You can apply it to |
| 21 | +your programs, too. |
| 22 | + |
| 23 | +When we speak of free software, we are referring to freedom, not |
| 24 | +price. Our General Public Licenses are designed to make sure that you |
| 25 | +have the freedom to distribute copies of free software (and charge for |
| 26 | +this service if you wish), that you receive source code or can get it |
| 27 | +if you want it, that you can change the software or use pieces of it |
| 28 | +in new free programs; and that you know you can do these things. |
| 29 | + |
| 30 | +To protect your rights, we need to make restrictions that forbid |
| 31 | +anyone to deny you these rights or to ask you to surrender the rights. |
| 32 | +These restrictions translate to certain responsibilities for you if |
| 33 | +you distribute copies of the software, or if you modify it. |
| 34 | + |
| 35 | +For example, if you distribute copies of such a program, whether |
| 36 | +gratis or for a fee, you must give the recipients all the rights that |
| 37 | +you have. You must make sure that they, too, receive or can get the |
| 38 | +source code. And you must show them these terms so they know their |
| 39 | +rights. |
| 40 | + |
| 41 | +We protect your rights with two steps: (1) copyright the software, and |
| 42 | +(2) offer you this license which gives you legal permission to copy, |
| 43 | +distribute and/or modify the software. |
| 44 | + |
| 45 | +Also, for each author's protection and ours, we want to make certain |
| 46 | +that everyone understands that there is no warranty for this free |
| 47 | +software. If the software is modified by someone else and passed on, |
| 48 | +we want its recipients to know that what they have is not the |
| 49 | +original, so that any problems introduced by others will not reflect |
| 50 | +on the original authors' reputations. |
| 51 | + |
| 52 | +Finally, any free program is threatened constantly by software |
| 53 | +patents. We wish to avoid the danger that redistributors of a free |
| 54 | +program will individually obtain patent licenses, in effect making the |
| 55 | +program proprietary. To prevent this, we have made it clear that any |
| 56 | +patent must be licensed for everyone's free use or not licensed at |
| 57 | +all. |
| 58 | + |
| 59 | +The precise terms and conditions for copying, distribution and |
| 60 | +modification follow. |
| 61 | + |
| 62 | +### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION |
| 63 | + |
| 64 | +**0.** This License applies to any program or other work which |
| 65 | +contains a notice placed by the copyright holder saying it may be |
| 66 | +distributed under the terms of this General Public License. The |
| 67 | +"Program", below, refers to any such program or work, and a "work |
| 68 | +based on the Program" means either the Program or any derivative work |
| 69 | +under copyright law: that is to say, a work containing the Program or |
| 70 | +a portion of it, either verbatim or with modifications and/or |
| 71 | +translated into another language. (Hereinafter, translation is |
| 72 | +included without limitation in the term "modification".) Each licensee |
| 73 | +is addressed as "you". |
| 74 | + |
| 75 | +Activities other than copying, distribution and modification are not |
| 76 | +covered by this License; they are outside its scope. The act of |
| 77 | +running the Program is not restricted, and the output from the Program |
| 78 | +is covered only if its contents constitute a work based on the Program |
| 79 | +(independent of having been made by running the Program). Whether that |
| 80 | +is true depends on what the Program does. |
| 81 | + |
| 82 | +**1.** You may copy and distribute verbatim copies of the Program's |
| 83 | +source code as you receive it, in any medium, provided that you |
| 84 | +conspicuously and appropriately publish on each copy an appropriate |
| 85 | +copyright notice and disclaimer of warranty; keep intact all the |
| 86 | +notices that refer to this License and to the absence of any warranty; |
| 87 | +and give any other recipients of the Program a copy of this License |
| 88 | +along with the Program. |
| 89 | + |
| 90 | +You may charge a fee for the physical act of transferring a copy, and |
| 91 | +you may at your option offer warranty protection in exchange for a |
| 92 | +fee. |
| 93 | + |
| 94 | +**2.** You may modify your copy or copies of the Program or any |
| 95 | +portion of it, thus forming a work based on the Program, and copy and |
| 96 | +distribute such modifications or work under the terms of Section 1 |
| 97 | +above, provided that you also meet all of these conditions: |
| 98 | + |
| 99 | + |
| 100 | +**a)** You must cause the modified files to carry prominent notices |
| 101 | +stating that you changed the files and the date of any change. |
| 102 | + |
| 103 | + |
| 104 | +**b)** You must cause any work that you distribute or publish, that in |
| 105 | +whole or in part contains or is derived from the Program or any part |
| 106 | +thereof, to be licensed as a whole at no charge to all third parties |
| 107 | +under the terms of this License. |
| 108 | + |
| 109 | + |
| 110 | +**c)** If the modified program normally reads commands interactively |
| 111 | +when run, you must cause it, when started running for such interactive |
| 112 | +use in the most ordinary way, to print or display an announcement |
| 113 | +including an appropriate copyright notice and a notice that there is |
| 114 | +no warranty (or else, saying that you provide a warranty) and that |
| 115 | +users may redistribute the program under these conditions, and telling |
| 116 | +the user how to view a copy of this License. (Exception: if the |
| 117 | +Program itself is interactive but does not normally print such an |
| 118 | +announcement, your work based on the Program is not required to print |
| 119 | +an announcement.) |
| 120 | + |
| 121 | +These requirements apply to the modified work as a whole. If |
| 122 | +identifiable sections of that work are not derived from the Program, |
| 123 | +and can be reasonably considered independent and separate works in |
| 124 | +themselves, then this License, and its terms, do not apply to those |
| 125 | +sections when you distribute them as separate works. But when you |
| 126 | +distribute the same sections as part of a whole which is a work based |
| 127 | +on the Program, the distribution of the whole must be on the terms of |
| 128 | +this License, whose permissions for other licensees extend to the |
| 129 | +entire whole, and thus to each and every part regardless of who wrote |
| 130 | +it. |
| 131 | + |
| 132 | +Thus, it is not the intent of this section to claim rights or contest |
| 133 | +your rights to work written entirely by you; rather, the intent is to |
| 134 | +exercise the right to control the distribution of derivative or |
| 135 | +collective works based on the Program. |
| 136 | + |
| 137 | +In addition, mere aggregation of another work not based on the Program |
| 138 | +with the Program (or with a work based on the Program) on a volume of |
| 139 | +a storage or distribution medium does not bring the other work under |
| 140 | +the scope of this License. |
| 141 | + |
| 142 | +**3.** You may copy and distribute the Program (or a work based on it, |
| 143 | +under Section 2) in object code or executable form under the terms of |
| 144 | +Sections 1 and 2 above provided that you also do one of the following: |
| 145 | + |
| 146 | + |
| 147 | +**a)** Accompany it with the complete corresponding machine-readable |
| 148 | +source code, which must be distributed under the terms of Sections 1 |
| 149 | +and 2 above on a medium customarily used for software interchange; or, |
| 150 | + |
| 151 | + |
| 152 | +**b)** Accompany it with a written offer, valid for at least three |
| 153 | +years, to give any third party, for a charge no more than your cost of |
| 154 | +physically performing source distribution, a complete machine-readable |
| 155 | +copy of the corresponding source code, to be distributed under the |
| 156 | +terms of Sections 1 and 2 above on a medium customarily used for |
| 157 | +software interchange; or, |
| 158 | + |
| 159 | + |
| 160 | +**c)** Accompany it with the information you received as to the offer |
| 161 | +to distribute corresponding source code. (This alternative is allowed |
| 162 | +only for noncommercial distribution and only if you received the |
| 163 | +program in object code or executable form with such an offer, in |
| 164 | +accord with Subsection b above.) |
| 165 | + |
| 166 | +The source code for a work means the preferred form of the work for |
| 167 | +making modifications to it. For an executable work, complete source |
| 168 | +code means all the source code for all modules it contains, plus any |
| 169 | +associated interface definition files, plus the scripts used to |
| 170 | +control compilation and installation of the executable. However, as a |
| 171 | +special exception, the source code distributed need not include |
| 172 | +anything that is normally distributed (in either source or binary |
| 173 | +form) with the major components (compiler, kernel, and so on) of the |
| 174 | +operating system on which the executable runs, unless that component |
| 175 | +itself accompanies the executable. |
| 176 | + |
| 177 | +If distribution of executable or object code is made by offering |
| 178 | +access to copy from a designated place, then offering equivalent |
| 179 | +access to copy the source code from the same place counts as |
| 180 | +distribution of the source code, even though third parties are not |
| 181 | +compelled to copy the source along with the object code. |
| 182 | + |
| 183 | +**4.** You may not copy, modify, sublicense, or distribute the Program |
| 184 | +except as expressly provided under this License. Any attempt otherwise |
| 185 | +to copy, modify, sublicense or distribute the Program is void, and |
| 186 | +will automatically terminate your rights under this License. However, |
| 187 | +parties who have received copies, or rights, from you under this |
| 188 | +License will not have their licenses terminated so long as such |
| 189 | +parties remain in full compliance. |
| 190 | + |
| 191 | +**5.** You are not required to accept this License, since you have not |
| 192 | +signed it. However, nothing else grants you permission to modify or |
| 193 | +distribute the Program or its derivative works. These actions are |
| 194 | +prohibited by law if you do not accept this License. Therefore, by |
| 195 | +modifying or distributing the Program (or any work based on the |
| 196 | +Program), you indicate your acceptance of this License to do so, and |
| 197 | +all its terms and conditions for copying, distributing or modifying |
| 198 | +the Program or works based on it. |
| 199 | + |
| 200 | +**6.** Each time you redistribute the Program (or any work based on |
| 201 | +the Program), the recipient automatically receives a license from the |
| 202 | +original licensor to copy, distribute or modify the Program subject to |
| 203 | +these terms and conditions. You may not impose any further |
| 204 | +restrictions on the recipients' exercise of the rights granted herein. |
| 205 | +You are not responsible for enforcing compliance by third parties to |
| 206 | +this License. |
| 207 | + |
| 208 | +**7.** If, as a consequence of a court judgment or allegation of |
| 209 | +patent infringement or for any other reason (not limited to patent |
| 210 | +issues), conditions are imposed on you (whether by court order, |
| 211 | +agreement or otherwise) that contradict the conditions of this |
| 212 | +License, they do not excuse you from the conditions of this License. |
| 213 | +If you cannot distribute so as to satisfy simultaneously your |
| 214 | +obligations under this License and any other pertinent obligations, |
| 215 | +then as a consequence you may not distribute the Program at all. For |
| 216 | +example, if a patent license would not permit royalty-free |
| 217 | +redistribution of the Program by all those who receive copies directly |
| 218 | +or indirectly through you, then the only way you could satisfy both it |
| 219 | +and this License would be to refrain entirely from distribution of the |
| 220 | +Program. |
| 221 | + |
| 222 | +If any portion of this section is held invalid or unenforceable under |
| 223 | +any particular circumstance, the balance of the section is intended to |
| 224 | +apply and the section as a whole is intended to apply in other |
| 225 | +circumstances. |
| 226 | + |
| 227 | +It is not the purpose of this section to induce you to infringe any |
| 228 | +patents or other property right claims or to contest validity of any |
| 229 | +such claims; this section has the sole purpose of protecting the |
| 230 | +integrity of the free software distribution system, which is |
| 231 | +implemented by public license practices. Many people have made |
| 232 | +generous contributions to the wide range of software distributed |
| 233 | +through that system in reliance on consistent application of that |
| 234 | +system; it is up to the author/donor to decide if he or she is willing |
| 235 | +to distribute software through any other system and a licensee cannot |
| 236 | +impose that choice. |
| 237 | + |
| 238 | +This section is intended to make thoroughly clear what is believed to |
| 239 | +be a consequence of the rest of this License. |
| 240 | + |
| 241 | +**8.** If the distribution and/or use of the Program is restricted in |
| 242 | +certain countries either by patents or by copyrighted interfaces, the |
| 243 | +original copyright holder who places the Program under this License |
| 244 | +may add an explicit geographical distribution limitation excluding |
| 245 | +those countries, so that distribution is permitted only in or among |
| 246 | +countries not thus excluded. In such case, this License incorporates |
| 247 | +the limitation as if written in the body of this License. |
| 248 | + |
| 249 | +**9.** The Free Software Foundation may publish revised and/or new |
| 250 | +versions of the General Public License from time to time. Such new |
| 251 | +versions will be similar in spirit to the present version, but may |
| 252 | +differ in detail to address new problems or concerns. |
| 253 | + |
| 254 | +Each version is given a distinguishing version number. If the Program |
| 255 | +specifies a version number of this License which applies to it and |
| 256 | +"any later version", you have the option of following the terms and |
| 257 | +conditions either of that version or of any later version published by |
| 258 | +the Free Software Foundation. If the Program does not specify a |
| 259 | +version number of this License, you may choose any version ever |
| 260 | +published by the Free Software Foundation. |
| 261 | + |
| 262 | +**10.** If you wish to incorporate parts of the Program into other |
| 263 | +free programs whose distribution conditions are different, write to |
| 264 | +the author to ask for permission. For software which is copyrighted by |
| 265 | +the Free Software Foundation, write to the Free Software Foundation; |
| 266 | +we sometimes make exceptions for this. Our decision will be guided by |
| 267 | +the two goals of preserving the free status of all derivatives of our |
| 268 | +free software and of promoting the sharing and reuse of software |
| 269 | +generally. |
| 270 | + |
| 271 | +**NO WARRANTY** |
| 272 | + |
| 273 | +**11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO |
| 274 | +WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. |
| 275 | +EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR |
| 276 | +OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY |
| 277 | +KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE |
| 278 | +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 279 | +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE |
| 280 | +PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME |
| 281 | +THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
| 282 | + |
| 283 | +**12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN |
| 284 | +WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY |
| 285 | +AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU |
| 286 | +FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR |
| 287 | +CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE |
| 288 | +PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING |
| 289 | +RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
| 290 | +FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF |
| 291 | +SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| 292 | +DAMAGES. |
| 293 | + |
| 294 | +### END OF TERMS AND CONDITIONS |
| 295 | + |
| 296 | +### How to Apply These Terms to Your New Programs |
| 297 | + |
| 298 | +If you develop a new program, and you want it to be of the greatest |
| 299 | +possible use to the public, the best way to achieve this is to make it |
| 300 | +free software which everyone can redistribute and change under these |
| 301 | +terms. |
| 302 | + |
| 303 | +To do so, attach the following notices to the program. It is safest to |
| 304 | +attach them to the start of each source file to most effectively |
| 305 | +convey the exclusion of warranty; and each file should have at least |
| 306 | +the "copyright" line and a pointer to where the full notice is found. |
| 307 | + |
| 308 | + one line to give the program's name and an idea of what it does. |
| 309 | + Copyright (C) yyyy name of author |
| 310 | + |
| 311 | + This program is free software; you can redistribute it and/or |
| 312 | + modify it under the terms of the GNU General Public License |
| 313 | + as published by the Free Software Foundation; either version 2 |
| 314 | + of the License, or (at your option) any later version. |
| 315 | + |
| 316 | + This program is distributed in the hope that it will be useful, |
| 317 | + but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 318 | + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 319 | + GNU General Public License for more details. |
| 320 | + |
| 321 | + You should have received a copy of the GNU General Public License |
| 322 | + along with this program; if not, write to the Free Software |
| 323 | + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 324 | + |
| 325 | +Also add information on how to contact you by electronic and paper |
| 326 | +mail. |
| 327 | + |
| 328 | +If the program is interactive, make it output a short notice like this |
| 329 | +when it starts in an interactive mode: |
| 330 | + |
| 331 | + Gnomovision version 69, Copyright (C) year name of author |
| 332 | + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details |
| 333 | + type `show w'. This is free software, and you are welcome |
| 334 | + to redistribute it under certain conditions; type `show c' |
| 335 | + for details. |
| 336 | + |
| 337 | +The hypothetical commands \`show w' and \`show c' should show the |
| 338 | +appropriate parts of the General Public License. Of course, the |
| 339 | +commands you use may be called something other than \`show w' and |
| 340 | +\`show c'; they could even be mouse-clicks or menu items--whatever |
| 341 | +suits your program. |
| 342 | + |
| 343 | +You should also get your employer (if you work as a programmer) or |
| 344 | +your school, if any, to sign a "copyright disclaimer" for the program, |
| 345 | +if necessary. Here is a sample; alter the names: |
| 346 | + |
| 347 | + Yoyodyne, Inc., hereby disclaims all copyright |
| 348 | + interest in the program `Gnomovision' |
| 349 | + (which makes passes at compilers) written |
| 350 | + by James Hacker. |
| 351 | + |
| 352 | + signature of Ty Coon, 1 April 1989 |
| 353 | + Ty Coon, President of Vice |
| 354 | + |
| 355 | +This General Public License does not permit incorporating your program |
| 356 | +into proprietary programs. If your program is a subroutine library, |
| 357 | +you may consider it more useful to permit linking proprietary |
| 358 | +applications with the library. If this is what you want to do, use the |
| 359 | +[GNU Lesser General Public |
| 360 | +License](https://www.gnu.org/licenses/lgpl.html) instead of this |
| 361 | +License. |
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