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1 GNU GENERAL PUBLIC LICENSE 2 Version 3, 29 June 2007 3 4 Copyright (C) 2007 Free Software Foundation, Inc. <http://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 11software and other kinds of works. 12 13 The licenses for most software and other practical works are designed 14to take away your freedom to share and change the works. By contrast, 15the GNU General Public License is intended to guarantee your freedom to 16share and change all versions of a program--to make sure it remains free 17software for all its users. We, the Free Software Foundation, use the 18GNU General Public License for most of our software; it applies also to 19any other work released this way by its authors. You can apply it to 20your programs, too. 21 22 When we speak of free software, we are referring to freedom, not 23price. Our General Public Licenses are designed to make sure that you 24have the freedom to distribute copies of free software (and charge for 25them if you wish), that you receive source code or can get it if you 26want it, that you can change the software or use pieces of it in new 27free programs, and that you know you can do these things. 28 29 To protect your rights, we need to prevent others from denying you 30these rights or asking you to surrender the rights. Therefore, you have 31certain responsibilities if you distribute copies of the software, or if 32you modify it: responsibilities to respect the freedom of others. 33 34 For example, if you distribute copies of such a program, whether 35gratis or for a fee, you must pass on to the recipients the same 36freedoms that you received. You must make sure that they, too, receive 37or can get the source code. And you must show them these terms so they 38know their rights. 39 40 Developers that use the GNU GPL protect your rights with two steps: 41(1) assert copyright on the software, and (2) offer you this License 42giving you legal permission to copy, distribute and/or modify it. 43 44 For the developers' and authors' protection, the GPL clearly explains 45that there is no warranty for this free software. For both users' and 46authors' sake, the GPL requires that modified versions be marked as 47changed, so that their problems will not be attributed erroneously to 48authors of previous versions. 49 50 Some devices are designed to deny users access to install or run 51modified versions of the software inside them, although the manufacturer 52can do so. This is fundamentally incompatible with the aim of 53protecting users' freedom to change the software. The systematic 54pattern of such abuse occurs in the area of products for individuals to 55use, which is precisely where it is most unacceptable. Therefore, we 56have designed this version of the GPL to prohibit the practice for those 57products. If such problems arise substantially in other domains, we 58stand ready to extend this provision to those domains in future versions 59of the GPL, as needed to protect the freedom of users. 60 61 Finally, every program is threatened constantly by software patents. 62States should not allow patents to restrict development and use of 63software on general-purpose computers, but in those that do, we wish to 64avoid the special danger that patents applied to a free program could 65make it effectively proprietary. To prevent this, the GPL assures that 66patents cannot be used to render the program non-free. 67 68 The precise terms and conditions for copying, distribution and 69modification follow. 70 71 TERMS AND CONDITIONS 72 73 0. Definitions. 74 75 "This License" refers to version 3 of the GNU General Public License. 76 77 "Copyright" also means copyright-like laws that apply to other kinds of 78works, such as semiconductor masks. 79 80 "The Program" refers to any copyrightable work licensed under this 81License. Each licensee is addressed as "you". "Licensees" and 82"recipients" may be individuals or organizations. 83 84 To "modify" a work means to copy from or adapt all or part of the work 85in a fashion requiring copyright permission, other than the making of an 86exact copy. 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Automatic Licensing of Downstream Recipients. 447 448 Each time you convey a covered work, the recipient automatically 449receives a license from the original licensors, to run, modify and 450propagate that work, subject to this License. You are not responsible 451for enforcing compliance by third parties with this License. 452 453 An "entity transaction" is a transaction transferring control of an 454organization, or substantially all assets of one, or subdividing an 455organization, or merging organizations. If propagation of a covered 456work results from an entity transaction, each party to that 457transaction who receives a copy of the work also receives whatever 458licenses to the work the party's predecessor in interest had or could 459give under the previous paragraph, plus a right to possession of the 460Corresponding Source of the work from the predecessor in interest, if 461the predecessor has it or can get it with reasonable efforts. 462 463 You may not impose any further restrictions on the exercise of the 464rights granted or affirmed under this License. For example, you may 465not impose a license fee, royalty, or other charge for exercise of 466rights granted under this License, and you may not initiate litigation 467(including a cross-claim or counterclaim in a lawsuit) alleging that 468any patent claim is infringed by making, using, selling, offering for 469sale, or importing the Program or any portion of it. 470 471 11. Patents. 472 473 A "contributor" is a copyright holder who authorizes use under this 474License of the Program or a work on which the Program is based. The 475work thus licensed is called the contributor's "contributor version". 476 477 A contributor's "essential patent claims" are all patent claims 478owned or controlled by the contributor, whether already acquired or 479hereafter acquired, that would be infringed by some manner, permitted 480by this License, of making, using, or selling its contributor version, 481but do not include claims that would be infringed only as a 482consequence of further modification of the contributor version. For 483purposes of this definition, "control" includes the right to grant 484patent sublicenses in a manner consistent with the requirements of 485this License. 486 487 Each contributor grants you a non-exclusive, worldwide, royalty-free 488patent license under the contributor's essential patent claims, to 489make, use, sell, offer for sale, import and otherwise run, modify and 490propagate the contents of its contributor version. 491 492 In the following three paragraphs, a "patent license" is any express 493agreement or commitment, however denominated, not to enforce a patent 494(such as an express permission to practice a patent or covenant not to 495sue for patent infringement). To "grant" such a patent license to a 496party means to make such an agreement or commitment not to enforce a 497patent against the party. 498 499 If you convey a covered work, knowingly relying on a patent license, 500and the Corresponding Source of the work is not available for anyone 501to copy, free of charge and under the terms of this License, through a 502publicly available network server or other readily accessible means, 503then you must either (1) cause the Corresponding Source to be so 504available, or (2) arrange to deprive yourself of the benefit of the 505patent license for this particular work, or (3) arrange, in a manner 506consistent with the requirements of this License, to extend the patent 507license to downstream recipients. "Knowingly relying" means you have 508actual knowledge that, but for the patent license, your conveying the 509covered work in a country, or your recipient's use of the covered work 510in a country, would infringe one or more identifiable patents in that 511country that you have reason to believe are valid. 512 513 If, pursuant to or in connection with a single transaction or 514arrangement, you convey, or propagate by procuring conveyance of, a 515covered work, and grant a patent license to some of the parties 516receiving the covered work authorizing them to use, propagate, modify 517or convey a specific copy of the covered work, then the patent license 518you grant is automatically extended to all recipients of the covered 519work and works based on it. 520 521 A patent license is "discriminatory" if it does not include within 522the scope of its coverage, prohibits the exercise of, or is 523conditioned on the non-exercise of one or more of the rights that are 524specifically granted under this License. You may not convey a covered 525work if you are a party to an arrangement with a third party that is 526in the business of distributing software, under which you make payment 527to the third party based on the extent of your activity of conveying 528the work, and under which the third party grants, to any of the 529parties who would receive the covered work from you, a discriminatory 530patent license (a) in connection with copies of the covered work 531conveyed by you (or copies made from those copies), or (b) primarily 532for and in connection with specific products or compilations that 533contain the covered work, unless you entered into that arrangement, 534or that patent license was granted, prior to 28 March 2007. 535 536 Nothing in this License shall be construed as excluding or limiting 537any implied license or other defenses to infringement that may 538otherwise be available to you under applicable patent law. 539 540 12. No Surrender of Others' Freedom. 541 542 If conditions are imposed on you (whether by court order, agreement or 543otherwise) that contradict the conditions of this License, they do not 544excuse you from the conditions of this License. If you cannot convey a 545covered work so as to satisfy simultaneously your obligations under this 546License and any other pertinent obligations, then as a consequence you may 547not convey it at all. For example, if you agree to terms that obligate you 548to collect a royalty for further conveying from those to whom you convey 549the Program, the only way you could satisfy both those terms and this 550License would be to refrain entirely from conveying the Program. 551 552 13. Use with the GNU Affero General Public License. 553 554 Notwithstanding any other provision of this License, you have 555permission to link or combine any covered work with a work licensed 556under version 3 of the GNU Affero General Public License into a single 557combined work, and to convey the resulting work. The terms of this 558License will continue to apply to the part which is the covered work, 559but the special requirements of the GNU Affero General Public License, 560section 13, concerning interaction through a network will apply to the 561combination as such. 562 563 14. Revised Versions of this License. 564 565 The Free Software Foundation may publish revised and/or new versions of 566the GNU General Public License from time to time. Such new versions will 567be similar in spirit to the present version, but may differ in detail to 568address new problems or concerns. 569 570 Each version is given a distinguishing version number. If the 571Program specifies that a certain numbered version of the GNU General 572Public License "or any later version" applies to it, you have the 573option of following the terms and conditions either of that numbered 574version or of any later version published by the Free Software 575Foundation. If the Program does not specify a version number of the 576GNU General Public License, you may choose any version ever published 577by the Free Software Foundation. 578 579 If the Program specifies that a proxy can decide which future 580versions of the GNU General Public License can be used, that proxy's 581public statement of acceptance of a version permanently authorizes you 582to choose that version for the Program. 583 584 Later license versions may give you additional or different 585permissions. However, no additional obligations are imposed on any 586author or copyright holder as a result of your choosing to follow a 587later version. 588 589 15. Disclaimer of Warranty. 590 591 THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 600 16. Limitation of Liability. 601 602 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610SUCH DAMAGES. 611 612 17. Interpretation of Sections 15 and 16. 613 614 If the disclaimer of warranty and limitation of liability provided 615above cannot be given local legal effect according to their terms, 616reviewing courts shall apply local law that most closely approximates 617an absolute waiver of all civil liability in connection with the 618Program, unless a warranty or assumption of liability accompanies a 619copy of the Program in return for a fee. 620 621 END OF TERMS AND CONDITIONS 622 623 How to Apply These Terms to Your New Programs 624 625 If you develop a new program, and you want it to be of the greatest 626possible use to the public, the best way to achieve this is to make it 627free software which everyone can redistribute and change under these terms. 628 629 To do so, attach the following notices to the program. It is safest 630to attach them to the start of each source file to most effectively 631state the exclusion of warranty; and each file should have at least 632the "copyright" line and a pointer to where the full notice is found. 633 634 <one line to give the program's name and a brief idea of what it does.> 635 Copyright (C) <year> <name of author> 636 637 This program is free software: you can redistribute it and/or modify 638 it under the terms of the GNU General Public License as published by 639 the Free Software Foundation, either version 3 of the License, or 640 (at your option) any later version. 641 642 This program is distributed in the hope that it will be useful, 643 but WITHOUT ANY WARRANTY; without even the implied warranty of 644 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 GNU General Public License for more details. 646 647 You should have received a copy of the GNU General Public License 648 along with this program. If not, see <http://www.gnu.org/licenses/>. 649 650Also add information on how to contact you by electronic and paper mail. 651 652 If the program does terminal interaction, make it output a short 653notice like this when it starts in an interactive mode: 654 655 <program> Copyright (C) <year> <name of author> 656 This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 This is free software, and you are welcome to redistribute it 658 under certain conditions; type `show c' for details. 659 660The hypothetical commands `show w' and `show c' should show the appropriate 661parts of the General Public License. Of course, your program's commands 662might be different; for a GUI interface, you would use an "about box". 663 664 You should also get your employer (if you work as a programmer) or school, 665if any, to sign a "copyright disclaimer" for the program, if necessary. 666For more information on this, and how to apply and follow the GNU GPL, see 667<http://www.gnu.org/licenses/>. 668 669 The GNU General Public License does not permit incorporating your program 670into proprietary programs. If your program is a subroutine library, you 671may consider it more useful to permit linking proprietary applications with 672the library. If this is what you want to do, use the GNU Lesser General 673Public License instead of this License. But first, please read 674<http://www.gnu.org/philosophy/why-not-lgpl.html>.