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1 GNU GENERAL PUBLIC LICENSE
2 Version 3, 29 June 2007
3
4 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
5 Everyone is permitted to copy and distribute verbatim copies
6 of this license document, but changing it is not allowed.
7
8 Preamble
9
10 The GNU General Public License is a free, copyleft license for software and
11 other kinds of works.
12
13 The licenses for most software and other practical works are designed to take
14 away your freedom to share and change the works. By contrast, the GNU General
15 Public License is intended to guarantee your freedom to share and change all
16 versions of a program--to make sure it remains free software for all its users.
17 We, the Free Software Foundation, use the GNU General Public License for most
18 of our software; it applies also to any other work released this way by its
19 authors. You can apply it to your programs, too.
20
21 When we speak of free software, we are referring to freedom, not price. Our
22 General Public Licenses are designed to make sure that you have the freedom
23 to distribute copies of free software (and charge for them if you wish), that
24 you receive source code or can get it if you want it, that you can change the
25 software or use pieces of it in new free programs, and that you know you can
26 do these things.
27
28 To protect your rights, we need to prevent others from denying you these rights
29 or asking you to surrender the rights. Therefore, you have certain
30 responsibilities if you distribute copies of the software, or if you modify it:
31 responsibilities to respect the freedom of others.
32
33 For example, if you distribute copies of such a program, whether gratis or for
34 a fee, you must pass on to the recipients the same freedoms that you received.
35 You must make sure that they, too, receive or can get the source code. And you
36 must show them these terms so they know their rights.
37
38 Developers that use the GNU GPL protect your rights with two steps: (1) assert
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40 permission to copy, distribute and/or modify it.
41
42 For the developers' and authors' protection, the GPL clearly explains that
43 there is no warranty for this free software. For both users' and authors' sake,
44 the GPL requires that modified versions be marked as changed, so that their
45 problems will not be attributed erroneously to authors of previous versions.
46
47 Some devices are designed to deny users access to install or run modified
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55 versions of the GPL, as needed to protect the freedom of users.
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57 Finally, every program is threatened constantly by software patents. States
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60 danger that patents applied to a free program could make it effectively
61 proprietary. To prevent this, the GPL assures that patents cannot be used to
62 render the program non-free.
63
64 TERMS AND CONDITIONS
65
66 0. Definitions.
67
68 "This License" refers to version 3 of the GNU General Public License.
69
70 "Copyright" also means copyright-like laws that apply to other kinds of works,
71 such as semiconductor masks.
72
73 "The Program" refers to any copyrightable work licensed under this License.
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75 individuals or organizations.
76
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83 Program.
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86 would make you directly or secondarily liable for infringement under applicable
87 copyright law, except executing it on a computer or modifying a private copy.
88 Propagation includes copying, distribution (with or without modification),
89 making available to the public, and in some countries other activities as well.
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92 make or receive copies. Mere interaction with a user through a computer
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96 extent that it includes a convenient and prominently visible feature that (1)
97 displays an appropriate copyright notice, and (2) tells the user that there is
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99 that licensees may convey the work under this License, and how to view a copy
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103 1. Source Code.
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114 work as a whole, that (a) is included in the normal form of packaging a Major
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140 2. Basic Permissions.
141
142 All rights granted under this License are granted for the term of copyright on
143 the Program, and are irrevocable provided the stated conditions are met. This
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148 copyright law.
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178 4. Conveying Verbatim Copies.
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180 You may convey verbatim copies of the Program's source code as you receive it,
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183 this License and any non-permissive terms added in accord with section 7 apply
184 to the code; keep intact all notices of the absence of any warranty; and give
185 all recipients a copy of this License along with the Program.
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190 5. Conveying Modified Source Versions.
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192 You may convey a work based on the Program, or the modifications to produce it
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194 provided that you also meet all of these conditions:
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196 a) The work must carry prominent notices stating that you modified it, and
197 giving a relevant date.
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199 b) The work must carry prominent notices stating that it is released under this
200 License and any conditions added under section 7. This requirement modifies the
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203 c) You must license the entire work, as a whole, under this License to anyone
204 who comes into possession of a copy. This License will therefore apply, along
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208 such permission if you have separately received it.
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210 d) If the work has interactive user interfaces, each must display Appropriate
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223 6. Conveying Non-Source Forms.
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225 You may convey a covered work in object code form under the terms of sections
226 4 and 5, provided that you also convey the machine-readable Corresponding
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229 a) Convey the object code in, or embodied in, a physical product (including a
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233 b) Convey the object code in, or embodied in, a physical product (including a
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240 reasonable cost of physically performing this conveying of source, or (2)
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243 c) Convey individual copies of the object code with a copy of the written
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248 d) Convey the object code by offering access from a designated place (gratis or
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259 e) Convey the object code using peer-to-peer transmission, provided you inform
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264 Corresponding Source as a System Library, need not be included in conveying the
265 object code work.
266
267 A "User Product" is either (1) a "consumer product", which means any tangible
268 personal property which is normally used for personal, family, or household
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270 In determining whether a product is a consumer product, doubtful cases shall be
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275 the product. A product is a consumer product regardless of whether the product
276 has substantial commercial, industrial or non-consumer uses, unless such uses
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279 "Installation Information" for a User Product means any methods, procedures,
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285
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291 this section must be accompanied by the Installation Information. But this
292 requirement does not apply if neither you nor any third party retains the
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294 work has been installed in ROM).
295
296 The requirement to provide Installation Information does not include a
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300 denied when the modification itself materially and adversely affects the
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305 with this section must be in a format that is publicly documented (and with an
306 implementation available to the public in source code form), and must require
307 no special password or key for unpacking, reading or copying.
308
309 7. Additional Terms.
310
311 "Additional permissions" are terms that supplement the terms of this License by
312 making exceptions from one or more of its conditions. Additional permissions
313 that are applicable to the entire Program shall be treated as though they were
314 included in this License, to the extent that they are valid under applicable
315 law. If additional permissions apply only to part of the Program, that part may
316 be used separately under those permissions, but the entire Program remains
317 governed by this License without regard to the additional permissions.
318
319 When you convey a copy of a covered work, you may at your option remove any
320 additional permissions from that copy, or from any part of it. (Additional
321 permissions may be written to require their own removal in certain cases when
322 you modify the work.) You may place additional permissions on material, added
323 by you to a covered work, for which you have or can give appropriate copyright
324 permission.
325
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327 covered work, you may (if authorized by the copyright holders of that material)
328 supplement the terms of this License with terms:
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330 a) Disclaiming warranty or limiting liability differently from the terms of
331 sections 15 and 16 of this License; or
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333 b) Requiring preservation of specified reasonable legal notices or author
334 attributions in that material or in the Appropriate Legal Notices displayed by
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351
352 All other non-permissive additional terms are considered "further restrictions"
353 within the meaning of section 10. If the Program as you received it, or any
354 part of it, contains a notice stating that it is governed by this License along
355 with a term that is a further restriction, you may remove that term. If a
356 license document contains a further restriction but permits relicensing or
357 conveying under this License, you may add to a covered work material governed
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360
361 If you add terms to a covered work in accord with this section, you must place,
362 in the relevant source files, a statement of the additional terms that apply to
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364
365 Additional terms, permissive or non-permissive, may be stated in the form of a
366 separately written license, or stated as exceptions; the above requirements
367 apply either way.
368
369 8. Termination.
370
371 You may not propagate or modify a covered work except as expressly provided
372 under this License. Any attempt otherwise to propagate or modify it is void,
373 and will automatically terminate your rights under this License (including any
374 patent licenses granted under the third paragraph of section 11).
375
376 However, if you cease all violation of this License, then your license from a
377 particular copyright holder is reinstated (a) provisionally, unless and until
378 the copyright holder explicitly and finally terminates your license, and (b)
379 permanently, if the copyright holder fails to notify you of the violation by
380 some reasonable means prior to 60 days after the cessation.
381
382 Moreover, your license from a particular copyright holder is reinstated
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384 reasonable means, this is the first time you have received notice of violation
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386 violation prior to 30 days after your receipt of the notice.
387
388 Termination of your rights under this section does not terminate the licenses
389 of parties who have received copies or rights from you under this License. If
390 your rights have been terminated and not permanently reinstated, you do not
391 qualify to receive new licenses for the same material under section 10.
392
393 9. Acceptance Not Required for Having Copies.
394
395 You are not required to accept this License in order to receive or run a copy
396 of the Program. Ancillary propagation of a covered work occurring solely as a
397 consequence of using peer-to-peer transmission to receive a copy likewise does
398 not require acceptance. However, nothing other than this License grants you
399 permission to propagate or modify any covered work. These actions infringe
400 copyright if you do not accept this License. Therefore, by modifying or
401 propagating a covered work, you indicate your acceptance of this License to do
402 so.
403
404 10. Automatic Licensing of Downstream Recipients.
405
406 Each time you convey a covered work, the recipient automatically receives a
407 license from the original licensors, to run, modify and propagate that work,
408 subject to this License. You are not responsible for enforcing compliance by
409 third parties with this License.
410
411 An "entity transaction" is a transaction transferring control of an
412 organization, or substantially all assets of one, or subdividing an
413 organization, or merging organizations. If propagation of a covered work results
414 from an entity transaction, each party to that transaction who receives a copy
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418 interest, if the predecessor has it or can get it with reasonable efforts.
419
420 You may not impose any further restrictions on the exercise of the rights
421 granted or affirmed under this License. For example, you may not impose a
422 license fee, royalty, or other charge for exercise of rights granted under this
423 License, and you may not initiate litigation (including a cross-claim or
424 counterclaim in a lawsuit) alleging that any patent claim is infringed by
425 making, using, selling, offering for sale, or importing the Program or any
426 portion of it.
427
428 11. Patents.
429
430 A "contributor" is a copyright holder who authorizes use under this License of
431 the Program or a work on which the Program is based. The work thus licensed is
432 called the contributor's "contributor version".
433
434 A contributor's "essential patent claims" are all patent claims owned or
435 controlled by the contributor, whether already acquired or hereafter acquired,
436 that would be infringed by some manner, permitted by this License, of making,
437 using, or selling its contributor version, but do not include claims that would
438 be infringed only as a consequence of further modification of the contributor
439 version. For purposes of this definition, "control" includes the right to grant
440 patent sublicenses in a manner consistent with the requirements of this
441 License.
442
443 Each contributor grants you a non-exclusive, worldwide, royalty-free patent
444 license under the contributor's essential patent claims, to make, use, sell,
445 offer for sale, import and otherwise run, modify and propagate the contents of
446 its contributor version.
447
448 In the following three paragraphs, a "patent license" is any express agreement
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451 infringement). To "grant" such a patent license to a party means to make such
452 an agreement or commitment not to enforce a patent against the party.
453
454 If you convey a covered work, knowingly relying on a patent license, and the
455 Corresponding Source of the work is not available for anyone to copy, free of
456 charge and under the terms of this License, through a publicly available
457 network server or other readily accessible means, then you must either (1)
458 cause the Corresponding Source to be so available, or (2) arrange to deprive
459 yourself of the benefit of the patent license for this particular work, or (3)
460 arrange, in a manner consistent with the requirements of this License, to
461 extend the patent license to downstream recipients. "Knowingly relying" means
462 you have actual knowledge that, but for the patent license, your conveying the
463 covered work in a country, or your recipient's use of the covered work in a
464 country, would infringe one or more identifiable patents in that country that
465 you have reason to believe are valid.
466
467 If, pursuant to or in connection with a single transaction or arrangement, you
468 convey, or propagate by procuring conveyance of, a covered work, and grant a
469 patent license to some of the parties receiving the covered work authorizing
470 them to use, propagate, modify or convey a specific copy of the covered work,
471 then the patent license you grant is automatically extended to all recipients
472 of the covered work and works based on it.
473
474 A patent license is "discriminatory" if it does not include within the scope of
475 its coverage, prohibits the exercise of, or is conditioned on the non-exercise
476 of one or more of the rights that are specifically granted under this License.
477 You may not convey a covered work if you are a party to an arrangement with a
478 third party that is in the business of distributing software, under which you
479 make payment to the third party based on the extent of your activity of
480 conveying the work, and under which the third party grants, to any of the
481 parties who would receive the covered work from you, a discriminatory patent
482 license (a) in connection with copies of the covered work conveyed by you (or
483 copies made from those copies), or (b) primarily for and in connection with
484 specific products or compilations that contain the covered work, unless you
485 entered into that arrangement, or that patent license was granted, prior to 28
486 March 2007.
487
488 Nothing in this License shall be construed as excluding or limiting any implied
489 license or other defenses to infringement that may otherwise be available to
490 you under applicable patent law.
491
492 12. No Surrender of Others' Freedom.
493
494 If conditions are imposed on you (whether by court order, agreement or
495 otherwise) that contradict the conditions of this License, they do not excuse
496 you from the conditions of this License. If you cannot convey a covered work so
497 as to satisfy simultaneously your obligations under this License and any other
498 pertinent obligations, then as a consequence you may not convey it at all. For
499 example, if you agree to terms that obligate you to collect a royalty for
500 further conveying from those to whom you convey the Program, the only way you
501 could satisfy both those terms and this License would be to refrain entirely
502 from conveying the Program.
503
504 13. Use with the GNU Affero General Public License.
505
506 Notwithstanding any other provision of this License, you have permission to
507 link or combine any covered work with a work licensed under version 3 of the
508 GNU Affero General Public License into a single combined work, and to convey
509 the resulting work. The terms of this License will continue to apply to the
510 part which is the covered work, but the special requirements of the GNU Affero
511 General Public License, section 13, concerning interaction through a network
512 will apply to the combination as such.
513
514 14. Revised Versions of this License.
515
516 The Free Software Foundation may publish revised and/or new versions of the GNU
517 General Public License from time to time. Such new versions will be similar in
518 spirit to the present version, but may differ in detail to address new problems
519 or concerns.
520
521 Each version is given a distinguishing version number. If the Program specifies
522 that a certain numbered version of the GNU General Public License "or any later
523 version" applies to it, you have the option of following the terms and
524 conditions either of that numbered version or of any later version published by
525 the Free Software Foundation. If the Program does not specify a version number
526 of the GNU General Public License, you may choose any version ever published by
527 the Free Software Foundation.
528
529 If the Program specifies that a proxy can decide which future versions of the
530 GNU General Public License can be used, that proxy's public statement of
531 acceptance of a version permanently authorizes you to choose that version for
532 the Program.
533
534 Later license versions may give you additional or different permissions.
535 However, no additional obligations are imposed on any author or copyright
536 holder as a result of your choosing to follow a later version.
537
538 15. Disclaimer of Warranty.
539
540 THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
541 LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
542 OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
543 EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
544 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO
545 THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM
546 PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
547 CORRECTION.
548
549 16. Limitation of Liability.
550
551 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
552 COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM
553 AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
554 SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
555 INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
556 BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
557 FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER
558 OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
559
560 17. Interpretation of Sections 15 and 16.
561
562 If the disclaimer of warranty and limitation of liability provided above cannot
563 be given local legal effect according to their terms, reviewing courts shall
564 apply local law that most closely approximates an absolute waiver of all civil
565 liability in connection with the Program, unless a warranty or assumption of
566 liability accompanies a copy of the Program in return for a fee.
567
568 END OF TERMS AND CONDITIONS
569
570 How to Apply These Terms to Your New Programs
571
572 If you develop a new program, and you want it to be of the greatest possible
573 use to the public, the best way to achieve this is to make it free software
574 which everyone can redistribute and change under these terms.
575
576 To do so, attach the following notices to the program. It is safest to attach
577 them to the start of each source file to most effectively state the exclusion
578 of warranty; and each file should have at least the "copyright" line and a
579 pointer to where the full notice is found.
580
581 rcal
582 Copyright (C) 2026 Matthew Forrester Wolffe
583
584 This program is free software: you can redistribute it and/or modify it
585 under the terms of the GNU General Public License as published by the Free
586 Software Foundation, either version 3 of the License, or (at your option)
587 any later version.
588
589 This program is distributed in the hope that it will be useful, but WITHOUT
590 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
591 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
592 more details.
593
594 You should have received a copy of the GNU General Public License along
595 with this program. If not, see <https://www.gnu.org/licenses/>.
596
597 Also add information on how to contact you by electronic and paper mail.
598
599 If the program does terminal interaction, make it output a short notice like
600 this when it starts in an interactive mode:
601
602 rcal Copyright (C) 2026 Matthew Forrester Wolffe
603 This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
604 This is free software, and you are welcome to redistribute it under certain
605 conditions; type `show c' for details.
606
607 The hypothetical commands `show w' and `show c' should show the appropriate
608 parts of the General Public License. Of course, your program's commands might
609 be different; for a GUI interface, you would use an "about box".
610
611 You should also get your employer (if you work as a programmer) or school, if
612 any, to sign a "copyright disclaimer" for the program, if necessary. For more
613 information on this, and how to apply and follow the GNU GPL, see
614 <https://www.gnu.org/licenses/>.
615
616 The GNU General Public License does not permit incorporating your program into
617 proprietary programs. If your program is a subroutine library, you may consider
618 it more useful to permit linking proprietary applications with the library. If
619 this is what you want to do, use the GNU Lesser General Public License instead
620 of this License. But first, please read <https://www.gnu.org/licenses/why-not-lgpl.html>.
621