1@c The GNU General Public License. 2@center Version 3, 29 June 2007 3 4@c This file is intended to be included within another document, 5@c hence no sectioning command or @node. 6 7@display 8Copyright @copyright{} 2007 Free Software Foundation, Inc. @url{http://fsf.org/} 9 10Everyone is permitted to copy and distribute verbatim copies of this 11license document, but changing it is not allowed. 12@end display 13 14@heading Preamble 15 16The GNU General Public License is a free, copyleft license for 17software and other kinds of works. 18 19The licenses for most software and other practical works are designed 20to take away your freedom to share and change the works. By contrast, 21the GNU General Public License is intended to guarantee your freedom 22to share and change all versions of a program---to make sure it remains 23free software for all its users. We, the Free Software Foundation, 24use the GNU General Public License for most of our software; it 25applies also to any other work released this way by its authors. You 26can apply it to your programs, too. 27 28When we speak of free software, we are referring to freedom, not 29price. Our General Public Licenses are designed to make sure that you 30have the freedom to distribute copies of free software (and charge for 31them if you wish), that you receive source code or can get it if you 32want it, that you can change the software or use pieces of it in new 33free programs, and that you know you can do these things. 34 35To protect your rights, we need to prevent others from denying you 36these rights or asking you to surrender the rights. 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This 232requirement modifies the requirement in section 4 to ``keep intact all 233notices''. 234 235@item 236You must license the entire work, as a whole, under this License to 237anyone who comes into possession of a copy. This License will 238therefore apply, along with any applicable section 7 additional terms, 239to the whole of the work, and all its parts, regardless of how they 240are packaged. This License gives no permission to license the work in 241any other way, but it does not invalidate such permission if you have 242separately received it. 243 244@item 245If the work has interactive user interfaces, each must display 246Appropriate Legal Notices; however, if the Program has interactive 247interfaces that do not display Appropriate Legal Notices, your work 248need not make them do so. 249@end enumerate 250 251A compilation of a covered work with other separate and independent 252works, which are not by their nature extensions of the covered work, 253and which are not combined with it such as to form a larger program, 254in or on a volume of a storage or distribution medium, is called an 255``aggregate'' if the compilation and its resulting copyright are not 256used to limit the access or legal rights of the compilation's users 257beyond what the individual works permit. Inclusion of a covered work 258in an aggregate does not cause this License to apply to the other 259parts of the aggregate. 260 261@item Conveying Non-Source Forms. 262 263You may convey a covered work in object code form under the terms of 264sections 4 and 5, provided that you also convey the machine-readable 265Corresponding Source under the terms of this License, in one of these 266ways: 267 268@enumerate a 269@item 270Convey the object code in, or embodied in, a physical product 271(including a physical distribution medium), accompanied by the 272Corresponding Source fixed on a durable physical medium customarily 273used for software interchange. 274 275@item 276Convey the object code in, or embodied in, a physical product 277(including a physical distribution medium), accompanied by a written 278offer, valid for at least three years and valid for as long as you 279offer spare parts or customer support for that product model, to give 280anyone who possesses the object code either (1) a copy of the 281Corresponding Source for all the software in the product that is 282covered by this License, on a durable physical medium customarily used 283for software interchange, for a price no more than your reasonable 284cost of physically performing this conveying of source, or (2) access 285to copy the Corresponding Source from a network server at no charge. 286 287@item 288Convey individual copies of the object code with a copy of the written 289offer to provide the Corresponding Source. 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If the place to copy 300the object code is a network server, the Corresponding Source may be 301on a different server (operated by you or a third party) that supports 302equivalent copying facilities, provided you maintain clear directions 303next to the object code saying where to find the Corresponding Source. 304Regardless of what server hosts the Corresponding Source, you remain 305obligated to ensure that it is available for as long as needed to 306satisfy these requirements. 307 308@item 309Convey the object code using peer-to-peer transmission, provided you 310inform other peers where the object code and Corresponding Source of 311the work are being offered to the general public at no charge under 312subsection 6d. 313 314@end enumerate 315 316A separable portion of the object code, whose source code is excluded 317from the Corresponding Source as a System Library, need not be 318included in conveying the object code work. 319 320A ``User Product'' is either (1) a ``consumer product'', which means any 321tangible personal property which is normally used for personal, 322family, or household purposes, or (2) anything designed or sold for 323incorporation into a dwelling. In determining whether a product is a 324consumer product, doubtful cases shall be resolved in favor of 325coverage. For a particular product received by a particular user, 326``normally used'' refers to a typical or common use of that class of 327product, regardless of the status of the particular user or of the way 328in which the particular user actually uses, or expects or is expected 329to use, the product. A product is a consumer product regardless of 330whether the product has substantial commercial, industrial or 331non-consumer uses, unless such uses represent the only significant 332mode of use of the product. 333 334``Installation Information'' for a User Product means any methods, 335procedures, authorization keys, or other information required to 336install and execute modified versions of a covered work in that User 337Product from a modified version of its Corresponding Source. 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But this requirement does not apply 349if neither you nor any third party retains the ability to install 350modified object code on the User Product (for example, the work has 351been installed in ROM). 352 353The requirement to provide Installation Information does not include a 354requirement to continue to provide support service, warranty, or 355updates for a work that has been modified or installed by the 356recipient, or for the User Product in which it has been modified or 357installed. Access to a network may be denied when the modification 358itself materially and adversely affects the operation of the network 359or violates the rules and protocols for communication across the 360network. 361 362Corresponding Source conveyed, and Installation Information provided, 363in accord with this section must be in a format that is publicly 364documented (and with an implementation available to the public in 365source code form), and must require no special password or key for 366unpacking, reading or copying. 367 368@item Additional Terms. 369 370``Additional permissions'' are terms that supplement the terms of this 371License by making exceptions from one or more of its conditions. 372Additional permissions that are applicable to the entire Program shall 373be treated as though they were included in this License, to the extent 374that they are valid under applicable law. If additional permissions 375apply only to part of the Program, that part may be used separately 376under those permissions, but the entire Program remains governed by 377this License without regard to the additional permissions. 378 379When you convey a copy of a covered work, you may at your option 380remove any additional permissions from that copy, or from any part of 381it. (Additional permissions may be written to require their own 382removal in certain cases when you modify the work.) 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If the Program as you 423received it, or any part of it, contains a notice stating that it is 424governed by this License along with a term that is a further 425restriction, you may remove that term. If a license document contains 426a further restriction but permits relicensing or conveying under this 427License, you may add to a covered work material governed by the terms 428of that license document, provided that the further restriction does 429not survive such relicensing or conveying. 430 431If you add terms to a covered work in accord with this section, you 432must place, in the relevant source files, a statement of the 433additional terms that apply to those files, or a notice indicating 434where to find the applicable terms. 435 436Additional terms, permissive or non-permissive, may be stated in the 437form of a separately written license, or stated as exceptions; the 438above requirements apply either way. 439 440@item Termination. 441 442You may not propagate or modify a covered work except as expressly 443provided under this License. Any attempt otherwise to propagate or 444modify it is void, and will automatically terminate your rights under 445this License (including any patent licenses granted under the third 446paragraph of section 11). 447 448However, if you cease all violation of this License, then your license 449from a particular copyright holder is reinstated (a) provisionally, 450unless and until the copyright holder explicitly and finally 451terminates your license, and (b) permanently, if the copyright holder 452fails to notify you of the violation by some reasonable means prior to 45360 days after the cessation. 454 455Moreover, your license from a particular copyright holder is 456reinstated permanently if the copyright holder notifies you of the 457violation by some reasonable means, this is the first time you have 458received notice of violation of this License (for any work) from that 459copyright holder, and you cure the violation prior to 30 days after 460your receipt of the notice. 461 462Termination of your rights under this section does not terminate the 463licenses of parties who have received copies or rights from you under 464this License. If your rights have been terminated and not permanently 465reinstated, you do not qualify to receive new licenses for the same 466material under section 10. 467 468@item Acceptance Not Required for Having Copies. 469 470You are not required to accept this License in order to receive or run 471a copy of the Program. Ancillary propagation of a covered work 472occurring solely as a consequence of using peer-to-peer transmission 473to receive a copy likewise does not require acceptance. However, 474nothing other than this License grants you permission to propagate or 475modify any covered work. These actions infringe copyright if you do 476not accept this License. Therefore, by modifying or propagating a 477covered work, you indicate your acceptance of this License to do so. 478 479@item Automatic Licensing of Downstream Recipients. 480 481Each time you convey a covered work, the recipient automatically 482receives a license from the original licensors, to run, modify and 483propagate that work, subject to this License. You are not responsible 484for enforcing compliance by third parties with this License. 485 486An ``entity transaction'' is a transaction transferring control of an 487organization, or substantially all assets of one, or subdividing an 488organization, or merging organizations. If propagation of a covered 489work results from an entity transaction, each party to that 490transaction who receives a copy of the work also receives whatever 491licenses to the work the party's predecessor in interest had or could 492give under the previous paragraph, plus a right to possession of the 493Corresponding Source of the work from the predecessor in interest, if 494the predecessor has it or can get it with reasonable efforts. 495 496You may not impose any further restrictions on the exercise of the 497rights granted or affirmed under this License. For example, you may 498not impose a license fee, royalty, or other charge for exercise of 499rights granted under this License, and you may not initiate litigation 500(including a cross-claim or counterclaim in a lawsuit) alleging that 501any patent claim is infringed by making, using, selling, offering for 502sale, or importing the Program or any portion of it. 503 504@item Patents. 505 506A ``contributor'' is a copyright holder who authorizes use under this 507License of the Program or a work on which the Program is based. The 508work thus licensed is called the contributor's ``contributor version''. 509 510A contributor's ``essential patent claims'' are all patent claims owned 511or controlled by the contributor, whether already acquired or 512hereafter acquired, that would be infringed by some manner, permitted 513by this License, of making, using, or selling its contributor version, 514but do not include claims that would be infringed only as a 515consequence of further modification of the contributor version. For 516purposes of this definition, ``control'' includes the right to grant 517patent sublicenses in a manner consistent with the requirements of 518this License. 519 520Each contributor grants you a non-exclusive, worldwide, royalty-free 521patent license under the contributor's essential patent claims, to 522make, use, sell, offer for sale, import and otherwise run, modify and 523propagate the contents of its contributor version. 524 525In the following three paragraphs, a ``patent license'' is any express 526agreement or commitment, however denominated, not to enforce a patent 527(such as an express permission to practice a patent or covenant not to 528sue for patent infringement). To ``grant'' such a patent license to a 529party means to make such an agreement or commitment not to enforce a 530patent against the party. 531 532If you convey a covered work, knowingly relying on a patent license, 533and the Corresponding Source of the work is not available for anyone 534to copy, free of charge and under the terms of this License, through a 535publicly available network server or other readily accessible means, 536then you must either (1) cause the Corresponding Source to be so 537available, or (2) arrange to deprive yourself of the benefit of the 538patent license for this particular work, or (3) arrange, in a manner 539consistent with the requirements of this License, to extend the patent 540license to downstream recipients. ``Knowingly relying'' means you have 541actual knowledge that, but for the patent license, your conveying the 542covered work in a country, or your recipient's use of the covered work 543in a country, would infringe one or more identifiable patents in that 544country that you have reason to believe are valid. 545 546If, pursuant to or in connection with a single transaction or 547arrangement, you convey, or propagate by procuring conveyance of, a 548covered work, and grant a patent license to some of the parties 549receiving the covered work authorizing them to use, propagate, modify 550or convey a specific copy of the covered work, then the patent license 551you grant is automatically extended to all recipients of the covered 552work and works based on it. 553 554A patent license is ``discriminatory'' if it does not include within the 555scope of its coverage, prohibits the exercise of, or is conditioned on 556the non-exercise of one or more of the rights that are specifically 557granted under this License. You may not convey a covered work if you 558are a party to an arrangement with a third party that is in the 559business of distributing software, under which you make payment to the 560third party based on the extent of your activity of conveying the 561work, and under which the third party grants, to any of the parties 562who would receive the covered work from you, a discriminatory patent 563license (a) in connection with copies of the covered work conveyed by 564you (or copies made from those copies), or (b) primarily for and in 565connection with specific products or compilations that contain the 566covered work, unless you entered into that arrangement, or that patent 567license was granted, prior to 28 March 2007. 568 569Nothing in this License shall be construed as excluding or limiting 570any implied license or other defenses to infringement that may 571otherwise be available to you under applicable patent law. 572 573@item No Surrender of Others' Freedom. 574 575If conditions are imposed on you (whether by court order, agreement or 576otherwise) that contradict the conditions of this License, they do not 577excuse you from the conditions of this License. If you cannot convey 578a covered work so as to satisfy simultaneously your obligations under 579this License and any other pertinent obligations, then as a 580consequence you may not convey it at all. For example, if you agree 581to terms that obligate you to collect a royalty for further conveying 582from those to whom you convey the Program, the only way you could 583satisfy both those terms and this License would be to refrain entirely 584from conveying the Program. 585 586@item Use with the GNU Affero General Public License. 587 588Notwithstanding any other provision of this License, you have 589permission to link or combine any covered work with a work licensed 590under version 3 of the GNU Affero General Public License into a single 591combined work, and to convey the resulting work. The terms of this 592License will continue to apply to the part which is the covered work, 593but the special requirements of the GNU Affero General Public License, 594section 13, concerning interaction through a network will apply to the 595combination as such. 596 597@item Revised Versions of this License. 598 599The Free Software Foundation may publish revised and/or new versions 600of the GNU General Public License from time to time. Such new 601versions will be similar in spirit to the present version, but may 602differ in detail to address new problems or concerns. 603 604Each version is given a distinguishing version number. If the Program 605specifies that a certain numbered version of the GNU General Public 606License ``or any later version'' applies to it, you have the option of 607following the terms and conditions either of that numbered version or 608of any later version published by the Free Software Foundation. If 609the Program does not specify a version number of the GNU General 610Public License, you may choose any version ever published by the Free 611Software Foundation. 612 613If the Program specifies that a proxy can decide which future versions 614of the GNU General Public License can be used, that proxy's public 615statement of acceptance of a version permanently authorizes you to 616choose that version for the Program. 617 618Later license versions may give you additional or different 619permissions. However, no additional obligations are imposed on any 620author or copyright holder as a result of your choosing to follow a 621later version. 622 623@item Disclaimer of Warranty. 624 625THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 626APPLICABLE LAW@. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 627HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM ``AS IS'' WITHOUT 628WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT 629LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 630A PARTICULAR PURPOSE@. THE ENTIRE RISK AS TO THE QUALITY AND 631PERFORMANCE OF THE PROGRAM IS WITH YOU@. SHOULD THE PROGRAM PROVE 632DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR 633CORRECTION. 634 635@item Limitation of Liability. 636 637IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 638WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR 639CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 640INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES 641ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT 642NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR 643LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM 644TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER 645PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 646 647@item Interpretation of Sections 15 and 16. 648 649If the disclaimer of warranty and limitation of liability provided 650above cannot be given local legal effect according to their terms, 651reviewing courts shall apply local law that most closely approximates 652an absolute waiver of all civil liability in connection with the 653Program, unless a warranty or assumption of liability accompanies a 654copy of the Program in return for a fee. 655 656@end enumerate 657 658@heading END OF TERMS AND CONDITIONS 659 660@heading How to Apply These Terms to Your New Programs 661 662If you develop a new program, and you want it to be of the greatest 663possible use to the public, the best way to achieve this is to make it 664free software which everyone can redistribute and change under these 665terms. 666 667To do so, attach the following notices to the program. It is safest 668to attach them to the start of each source file to most effectively 669state the exclusion of warranty; and each file should have at least 670the ``copyright'' line and a pointer to where the full notice is found. 671 672@smallexample 673@var{one line to give the program's name and a brief idea of what it does.} 674Copyright (C) @var{year} @var{name of author} 675 676This program is free software: you can redistribute it and/or modify 677it under the terms of the GNU General Public License as published by 678the Free Software Foundation, either version 3 of the License, or (at 679your option) any later version. 680 681This program is distributed in the hope that it will be useful, but 682WITHOUT ANY WARRANTY; without even the implied warranty of 683MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE@. See the GNU 684General Public License for more details. 685 686You should have received a copy of the GNU General Public License 687along with this program. If not, see @url{http://www.gnu.org/licenses/}. 688@end smallexample 689 690Also add information on how to contact you by electronic and paper mail. 691 692If the program does terminal interaction, make it output a short 693notice like this when it starts in an interactive mode: 694 695@smallexample 696@var{program} Copyright (C) @var{year} @var{name of author} 697This program comes with ABSOLUTELY NO WARRANTY; for details type @samp{show w}. 698This is free software, and you are welcome to redistribute it 699under certain conditions; type @samp{show c} for details. 700@end smallexample 701 702The hypothetical commands @samp{show w} and @samp{show c} should show 703the appropriate parts of the General Public License. Of course, your 704program's commands might be different; for a GUI interface, you would 705use an ``about box''. 706 707You should also get your employer (if you work as a programmer) or school, 708if any, to sign a ``copyright disclaimer'' for the program, if necessary. 709For more information on this, and how to apply and follow the GNU GPL, see 710@url{http://www.gnu.org/licenses/}. 711 712The GNU General Public License does not permit incorporating your 713program into proprietary programs. If your program is a subroutine 714library, you may consider it more useful to permit linking proprietary 715applications with the library. If this is what you want to do, use 716the GNU Lesser General Public License instead of this License. But 717first, please read @url{http://www.gnu.org/philosophy/why-not-lgpl.html}. 718