1 GNU GENERAL PUBLIC LICENSE 2 3 Version 3, 29 June 2007 4 5 Copyright © 2007 Free Software Foundation, Inc. <https://fsf.org/> 6 7 Everyone is permitted to copy and distribute verbatim copies of this license 8 document, but changing it is not allowed. 9 10 Preamble 11 12 The GNU General Public License is a free, copyleft license for software and 13 other kinds of works. 14 15 The licenses for most software and other practical works are designed to take 16 away your freedom to share and change the works. By contrast, the GNU General 17 Public License is intended to guarantee your freedom to share and change all 18 versions of a program--to make sure it remains free software for all its users. 19 We, the Free Software Foundation, use the GNU General Public License for most 20 of our software; it applies also to any other work released this way by its 21 authors. You can apply 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 them if you wish), that 26 you receive source code or can get it if you want it, that you can change 27 the software or use pieces of it in new free programs, and that you know you 28 can do these things. 29 30 To protect your rights, we need to prevent others from denying you these rights 31 or asking you to surrender the rights. Therefore, you have certain responsibilities 32 if you distribute copies of the software, or if you modify it: responsibilities 33 to respect the freedom of others. 34 35 For example, if you distribute copies of such a program, whether gratis or 36 for a fee, you must pass on to the recipients the same freedoms that you received. 37 You must make sure that they, too, receive or can get the source code. And 38 you must show them these terms so they know their rights. 39 40 Developers that use the GNU GPL protect your rights with two steps: (1) assert 41 copyright on the software, and (2) offer you this License giving you legal 42 permission to copy, distribute and/or modify it. 43 44 For the developers' and authors' protection, the GPL clearly explains that 45 there is no warranty for this free software. For both users' and authors' 46 sake, the GPL requires that modified versions be marked as changed, so that 47 their problems will not be attributed erroneously to authors of previous versions. 48 49 Some devices are designed to deny users access to install or run modified 50 versions of the software inside them, although the manufacturer can do so. 51 This is fundamentally incompatible with the aim of protecting users' freedom 52 to change the software. The systematic pattern of such abuse occurs in the 53 area of products for individuals to use, which is precisely where it is most 54 unacceptable. Therefore, we have designed this version of the GPL to prohibit 55 the practice for those products. If such problems arise substantially in other 56 domains, we stand ready to extend this provision to those domains in future 57 versions of the GPL, as needed to protect the freedom of users. 58 59 Finally, every program is threatened constantly by software patents. States 60 should not allow patents to restrict development and use of software on general-purpose 61 computers, but in those that do, we wish to avoid the special danger that 62 patents applied to a free program could make it effectively proprietary. To 63 prevent this, the GPL assures that patents cannot be used to render the program 64 non-free. 65 66 The precise terms and conditions for copying, distribution and modification 67 follow. 68 69 TERMS AND CONDITIONS 70 71 0. Definitions. 72 73 "This License" refers to version 3 of the GNU General Public License. 74 75 "Copyright" also means copyright-like laws that apply to other kinds of works, 76 such as semiconductor masks. 77 78 "The Program" refers to any copyrightable work licensed under this License. 79 Each licensee is addressed as "you". "Licensees" and "recipients" may be individuals 80 or organizations. 81 82 To "modify" a work means to copy from or adapt all or part of the work in 83 a fashion requiring copyright permission, other than the making of an exact 84 copy. The resulting work is called a "modified version" of the earlier work 85 or a work "based on" the earlier work. 86 87 A "covered work" means either the unmodified Program or a work based on the 88 Program. 89 90 To "propagate" a work means to do anything with it that, without permission, 91 would make you directly or secondarily liable for infringement under applicable 92 copyright law, except executing it on a computer or modifying a private copy. 93 Propagation includes copying, distribution (with or without modification), 94 making available to the public, and in some countries other activities as 95 well. 96 97 To "convey" a work means any kind of propagation that enables other parties 98 to make or receive copies. Mere interaction with a user through a computer 99 network, with no transfer of a copy, is not conveying. 100 101 An interactive user interface displays "Appropriate Legal Notices" to the 102 extent that it includes a convenient and prominently visible feature that 103 (1) displays an appropriate copyright notice, and (2) tells the user that 104 there is no warranty for the work (except to the extent that warranties are 105 provided), that licensees may convey the work under this License, and how 106 to view a copy of this License. If the interface presents a list of user commands 107 or options, such as a menu, a prominent item in the list meets this criterion. 108 109 1. Source Code. 110 111 The "source code" for a work means the preferred form of the work for making 112 modifications to it. 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The output from running a covered work is covered by this License 152 only if the output, given its content, constitutes a covered work. This License 153 acknowledges your rights of fair use or other equivalent, as provided by copyright 154 law. 155 156 You may make, run and propagate covered works that you do not convey, without 157 conditions so long as your license otherwise remains in force. You may convey 158 covered works to others for the sole purpose of having them make modifications 159 exclusively for you, or provide you with facilities for running those works, 160 provided that you comply with the terms of this License in conveying all material 161 for which you do not control copyright. 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Protecting Users' Legal Rights From Anti-Circumvention Law. 170 171 No covered work shall be deemed part of an effective technological measure 172 under any applicable law fulfilling obligations under article 11 of the WIPO 173 copyright treaty adopted on 20 December 1996, or similar laws prohibiting 174 or restricting circumvention of such measures. 175 176 When you convey a covered work, you waive any legal power to forbid circumvention 177 of technological measures to the extent such circumvention is effected by 178 exercising rights under this License with respect to the covered work, and 179 you disclaim any intention to limit operation or modification of the work 180 as a means of enforcing, against the work's users, your or third parties' 181 legal rights to forbid circumvention of technological measures. 182 183 4. Conveying Verbatim Copies. 184 185 You may convey verbatim copies of the Program's source code as you receive 186 it, in any medium, provided that you conspicuously and appropriately publish 187 on each copy an appropriate copyright notice; keep intact all notices stating 188 that this License and any non-permissive terms added in accord with section 189 7 apply to the code; keep intact all notices of the absence of any warranty; 190 and give all recipients a copy of this License along with the Program. 191 192 You may charge any price or no price for each copy that you convey, and you 193 may offer support or warranty protection for a fee. 194 195 5. 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This License gives 212 no permission to license the work in any other way, but it does not invalidate 213 such permission if you have separately received it. 214 215 d) If the work has interactive user interfaces, each must display Appropriate 216 Legal Notices; however, if the Program has interactive interfaces that do 217 not display Appropriate Legal Notices, your work need not make them do so. 218 219 A compilation of a covered work with other separate and independent works, 220 which are not by their nature extensions of the covered work, and which are 221 not combined with it such as to form a larger program, in or on a volume of 222 a storage or distribution medium, is called an "aggregate" if the compilation 223 and its resulting copyright are not used to limit the access or legal rights 224 of the compilation's users beyond what the individual works permit. Inclusion 225 of a covered work in an aggregate does not cause this License to apply to 226 the other parts of the aggregate. 227 228 6. Conveying Non-Source Forms. 229 230 You may convey a covered work in object code form under the terms of sections 231 4 and 5, provided that you also convey the machine-readable Corresponding 232 Source under the terms of this License, in one of these ways: 233 234 a) Convey the object code in, or embodied in, a physical product (including 235 a physical distribution medium), accompanied by the Corresponding Source fixed 236 on a durable physical medium customarily used for software interchange. 237 238 b) Convey the object code in, or embodied in, a physical product (including 239 a physical distribution medium), accompanied by a written offer, valid for 240 at least three years and valid for as long as you offer spare parts or customer 241 support for that product model, to give anyone who possesses the object code 242 either (1) a copy of the Corresponding Source for all the software in the 243 product that is covered by this License, on a durable physical medium customarily 244 used for software interchange, for a price no more than your reasonable cost 245 of physically performing this conveying of source, or (2) access to copy the 246 Corresponding Source from a network server at no charge. 247 248 c) Convey individual copies of the object code with a copy of the written 249 offer to provide the Corresponding Source. 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Regardless 261 of what server hosts the Corresponding Source, you remain obligated to ensure 262 that it is available for as long as needed to satisfy these requirements. 263 264 e) Convey the object code using peer-to-peer transmission, provided you inform 265 other peers where the object code and Corresponding Source of the work are 266 being offered to the general public at no charge under subsection 6d. 267 268 A separable portion of the object code, whose source code is excluded from 269 the Corresponding Source as a System Library, need not be included in conveying 270 the object code work. 271 272 A "User Product" is either (1) a "consumer product", which means any tangible 273 personal property which is normally used for personal, family, or household 274 purposes, or (2) anything designed or sold for incorporation into a dwelling. 275 In determining whether a product is a consumer product, doubtful cases shall 276 be resolved in favor of coverage. 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Access to a network may be denied 305 when the modification itself materially and adversely affects the operation 306 of the network or violates the rules and protocols for communication across 307 the network. 308 309 Corresponding Source conveyed, and Installation Information provided, in accord 310 with this section must be in a format that is publicly documented (and with 311 an implementation available to the public in source code form), and must require 312 no special password or key for unpacking, reading or copying. 313 314 7. Additional Terms. 315 316 "Additional permissions" are terms that supplement the terms of this License 317 by making exceptions from one or more of its conditions. Additional permissions 318 that are applicable to the entire Program shall be treated as though they 319 were included in this License, to the extent that they are valid under applicable 320 law. If additional permissions apply only to part of the Program, that part 321 may be used separately under those permissions, but the entire Program remains 322 governed by this License without regard to the additional permissions. 323 324 When you convey a copy of a covered work, you may at your option remove any 325 additional permissions from that copy, or from any part of it. (Additional 326 permissions may be written to require their own removal in certain cases when 327 you modify the work.) You may place additional permissions on material, added 328 by you to a covered work, for which you have or can give appropriate copyright 329 permission. 330 331 Notwithstanding any other provision of this License, for material you add 332 to a covered work, you may (if authorized by the copyright holders of that 333 material) supplement the terms of this License with terms: 334 335 a) Disclaiming warranty or limiting liability differently from the terms of 336 sections 15 and 16 of this License; or 337 338 b) Requiring preservation of specified reasonable legal notices or author 339 attributions in that material or in the Appropriate Legal Notices displayed 340 by works containing it; or 341 342 c) Prohibiting misrepresentation of the origin of that material, or requiring 343 that modified versions of such material be marked in reasonable ways as different 344 from the original version; or 345 346 d) Limiting the use for publicity purposes of names of licensors or authors 347 of the material; or 348 349 e) Declining to grant rights under trademark law for use of some trade names, 350 trademarks, or service marks; or 351 352 f) Requiring indemnification of licensors and authors of that material by 353 anyone who conveys the material (or modified versions of it) with contractual 354 assumptions of liability to the recipient, for any liability that these contractual 355 assumptions directly impose on those licensors and authors. 356 357 All other non-permissive additional terms are considered "further restrictions" 358 within the meaning of section 10. If the Program as you received it, or any 359 part of it, contains a notice stating that it is governed by this License 360 along with a term that is a further restriction, you may remove that term. 361 If a license document contains a further restriction but permits relicensing 362 or conveying under this License, you may add to a covered work material governed 363 by the terms of that license document, provided that the further restriction 364 does not survive such relicensing or conveying. 365 366 If you add terms to a covered work in accord with this section, you must place, 367 in the relevant source files, a statement of the additional terms that apply 368 to those files, or a notice indicating where to find the applicable terms. 369 370 Additional terms, permissive or non-permissive, may be stated in the form 371 of a separately written license, or stated as exceptions; the above requirements 372 apply either way. 373 374 8. Termination. 375 376 You may not propagate or modify a covered work except as expressly provided 377 under this License. Any attempt otherwise to propagate or modify it is void, 378 and will automatically terminate your rights under this License (including 379 any patent licenses granted under the third paragraph of section 11). 380 381 However, if you cease all violation of this License, then your license from 382 a particular copyright holder is reinstated (a) provisionally, unless and 383 until the copyright holder explicitly and finally terminates your license, 384 and (b) permanently, if the copyright holder fails to notify you of the violation 385 by some reasonable means prior to 60 days after the cessation. 386 387 Moreover, your license from a particular copyright holder is reinstated permanently 388 if the copyright holder notifies you of the violation by some reasonable means, 389 this is the first time you have received notice of violation of this License 390 (for any work) from that copyright holder, and you cure the violation prior 391 to 30 days after your receipt of the notice. 392 393 Termination of your rights under this section does not terminate the licenses 394 of parties who have received copies or rights from you under this License. 395 If your rights have been terminated and not permanently reinstated, you do 396 not qualify to receive new licenses for the same material under section 10. 397 398 9. Acceptance Not Required for Having Copies. 399 400 You are not required to accept this License in order to receive or run a copy 401 of the Program. Ancillary propagation of a covered work occurring solely as 402 a consequence of using peer-to-peer transmission to receive a copy likewise 403 does not require acceptance. However, nothing other than this License grants 404 you permission to propagate or modify any covered work. These actions infringe 405 copyright if you do not accept this License. Therefore, by modifying or propagating 406 a covered work, you indicate your acceptance of this License to do so. 407 408 10. Automatic Licensing of Downstream Recipients. 409 410 Each time you convey a covered work, the recipient automatically receives 411 a license from the original licensors, to run, modify and propagate that work, 412 subject to this License. You are not responsible for enforcing compliance 413 by third parties with this License. 414 415 An "entity transaction" is a transaction transferring control of an organization, 416 or substantially all assets of one, or subdividing an organization, or merging 417 organizations. If propagation of a covered work results from an entity transaction, 418 each party to that transaction who receives a copy of the work also receives 419 whatever licenses to the work the party's predecessor in interest had or could 420 give under the previous paragraph, plus a right to possession of the Corresponding 421 Source of the work from the predecessor in interest, if the predecessor has 422 it or can get it with reasonable efforts. 423 424 You may not impose any further restrictions on the exercise of the rights 425 granted or affirmed under this License. For example, you may not impose a 426 license fee, royalty, or other charge for exercise of rights granted under 427 this License, and you may not initiate litigation (including a cross-claim 428 or counterclaim in a lawsuit) alleging that any patent claim is infringed 429 by making, using, selling, offering for sale, or importing the Program or 430 any portion of it. 431 432 11. Patents. 433 434 A "contributor" is a copyright holder who authorizes use under this License 435 of the Program or a work on which the Program is based. The work thus licensed 436 is called the contributor's "contributor version". 437 438 A contributor's "essential patent claims" are all patent claims owned or controlled 439 by the contributor, whether already acquired or hereafter acquired, that would 440 be infringed by some manner, permitted by this License, of making, using, 441 or selling its contributor version, but do not include claims that would be 442 infringed only as a consequence of further modification of the contributor 443 version. For purposes of this definition, "control" includes the right to 444 grant patent sublicenses in a manner consistent with the requirements of this 445 License. 446 447 Each contributor grants you a non-exclusive, worldwide, royalty-free patent 448 license under the contributor's essential patent claims, to make, use, sell, 449 offer for sale, import and otherwise run, modify and propagate the contents 450 of its contributor version. 451 452 In the following three paragraphs, a "patent license" is any express agreement 453 or commitment, however denominated, not to enforce a patent (such as an express 454 permission to practice a patent or covenant not to sue for patent infringement). 455 To "grant" such a patent license to a party means to make such an agreement 456 or commitment not to enforce a patent against the party. 457 458 If you convey a covered work, knowingly relying on a patent license, and the 459 Corresponding Source of the work is not available for anyone to copy, free 460 of charge and under the terms of this License, through a publicly available 461 network server or other readily accessible means, then you must either (1) 462 cause the Corresponding Source to be so available, or (2) arrange to deprive 463 yourself of the benefit of the patent license for this particular work, or 464 (3) arrange, in a manner consistent with the requirements of this License, 465 to extend the patent license to downstream recipients. "Knowingly relying" 466 means you have actual knowledge that, but for the patent license, your conveying 467 the covered work in a country, or your recipient's use of the covered work 468 in a country, would infringe one or more identifiable patents in that country 469 that you have reason to believe are valid. 470 471 If, pursuant to or in connection with a single transaction or arrangement, 472 you convey, or propagate by procuring conveyance of, a covered work, and grant 473 a patent license to some of the parties receiving the covered work authorizing 474 them to use, propagate, modify or convey a specific copy of the covered work, 475 then the patent license you grant is automatically extended to all recipients 476 of the covered work and works based on it. 477 478 A patent license is "discriminatory" if it does not include within the scope 479 of its coverage, prohibits the exercise of, or is conditioned on the non-exercise 480 of one or more of the rights that are specifically granted under this License. 481 You may not convey a covered work if you are a party to an arrangement with 482 a third party that is in the business of distributing software, under which 483 you make payment to the third party based on the extent of your activity of 484 conveying the work, and under which the third party grants, to any of the 485 parties who would receive the covered work from you, a discriminatory patent 486 license (a) in connection with copies of the covered work conveyed by you 487 (or copies made from those copies), or (b) primarily for and in connection 488 with specific products or compilations that contain the covered work, unless 489 you entered into that arrangement, or that patent license was granted, prior 490 to 28 March 2007. 491 492 Nothing in this License shall be construed as excluding or limiting any implied 493 license or other defenses to infringement that may otherwise be available 494 to you under applicable patent law. 495 496 12. No Surrender of Others' Freedom. 497 498 If conditions are imposed on you (whether by court order, agreement or otherwise) 499 that contradict the conditions of this License, they do not excuse you from 500 the conditions of this License. If you cannot convey a covered work so as 501 to satisfy simultaneously your obligations under this License and any other 502 pertinent obligations, then as a consequence you may not convey it at all. 503 For example, if you agree to terms that obligate you to collect a royalty 504 for further conveying from those to whom you convey the Program, the only 505 way you could satisfy both those terms and this License would be to refrain 506 entirely from conveying the Program. 507 508 13. Use with the GNU Affero General Public License. 509 510 Notwithstanding any other provision of this License, you have permission to 511 link or combine any covered work with a work licensed under version 3 of the 512 GNU Affero General Public License into a single combined work, and to convey 513 the resulting work. The terms of this License will continue to apply to the 514 part which is the covered work, but the special requirements of the GNU Affero 515 General Public License, section 13, concerning interaction through a network 516 will apply to the combination as such. 517 518 14. Revised Versions of this License. 519 520 The Free Software Foundation may publish revised and/or new versions of the 521 GNU General Public License from time to time. Such new versions will be similar 522 in spirit to the present version, but may differ in detail to address new 523 problems or concerns. 524 525 Each version is given a distinguishing version number. If the Program specifies 526 that a certain numbered version of the GNU General Public License "or any 527 later version" applies to it, you have the option of following the terms and 528 conditions either of that numbered version or of any later version published 529 by the Free Software Foundation. If the Program does not specify a version 530 number of the GNU General Public License, you may choose any version ever 531 published by the Free Software Foundation. 532 533 If the Program specifies that a proxy can decide which future versions of 534 the GNU General Public License can be used, that proxy's public statement 535 of acceptance of a version permanently authorizes you to choose that version 536 for the Program. 537 538 Later license versions may give you additional or different permissions. However, 539 no additional obligations are imposed on any author or copyright holder as 540 a result of your choosing to follow a later version. 541 542 15. Disclaimer of Warranty. 543 544 THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE 545 LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR 546 OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER 547 EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 548 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 549 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM 550 PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR 551 CORRECTION. 552 553 16. Limitation of Liability. 554 555 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL 556 ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM 557 AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, 558 INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO 559 USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED 560 INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE 561 PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER 562 PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 563 564 17. Interpretation of Sections 15 and 16. 565 566 If the disclaimer of warranty and limitation of liability provided above cannot 567 be given local legal effect according to their terms, reviewing courts shall 568 apply local law that most closely approximates an absolute waiver of all civil 569 liability in connection with the Program, unless a warranty or assumption 570 of liability accompanies a copy of the Program in return for a fee. END OF 571 TERMS AND CONDITIONS 572 573 How to Apply These Terms to Your New Programs 574 575 If you develop a new program, and you want it to be of the greatest possible 576 use to the public, the best way to achieve this is to make it free software 577 which everyone can redistribute and change under these terms. 578 579 To do so, attach the following notices to the program. It is safest to attach 580 them to the start of each source file to most effectively state the exclusion 581 of warranty; and each file should have at least the "copyright" line and a 582 pointer to where the full notice is found. 583 584 <one line to give the program's name and a brief idea of what it does.> 585 586 Copyright (C) <year> <name of author> 587 588 This program is free software: you can redistribute it and/or modify it under 589 the terms of the GNU General Public License as published by the Free Software 590 Foundation, either version 3 of the License, or (at your option) any later 591 version. 592 593 This program is distributed in the hope that it will be useful, but WITHOUT 594 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 595 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 596 597 You should have received a copy of the GNU General Public License along with 598 this program. If not, see <https://www.gnu.org/licenses/>. 599 600 Also add information on how to contact you by electronic and paper mail. 601 602 If the program does terminal interaction, make it output a short notice like 603 this when it starts in an interactive mode: 604 605 <program> Copyright (C) <year> <name of author> 606 607 This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 608 609 This is free software, and you are welcome to redistribute it under certain 610 conditions; type `show c' for details. 611 612 The hypothetical commands `show w' and `show c' should show the appropriate 613 parts of the General Public License. Of course, your program's commands might 614 be different; for a GUI interface, you would use an "about box". 615 616 You should also get your employer (if you work as a programmer) or school, 617 if any, to sign a "copyright disclaimer" for the program, if necessary. For 618 more information on this, and how to apply and follow the GNU GPL, see <https://www.gnu.org/licenses/>. 619 620 The GNU General Public License does not permit incorporating your program 621 into proprietary programs. If your program is a subroutine library, you may 622 consider it more useful to permit linking proprietary applications with the 623 library. If this is what you want to do, use the GNU Lesser General Public 624 License instead of this License. But first, please read <https://www.gnu.org/ 625 licenses /why-not-lgpl.html>.