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| 1 | Unless indicated otherwise (a license reference in file headers, or a |
| 2 | LICENSE file in a directory), all OpenCog source files use the AGPL |
| 3 | with additional permissions to link OpenCog libraries with non-AGPL |
| 4 | works; the text of the OpenCog linking exception is located at the end |
| 5 | of this file. |
| 6 | |
| 7 | |
| 8 | |
| 9 | GNU AFFERO GENERAL PUBLIC LICENSE |
| 10 | Version 3, 19 November 2007 |
| 11 | |
| 12 | Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> |
| 13 | Everyone is permitted to copy and distribute verbatim copies |
| 14 | of this license document, but changing it is not allowed. |
| 15 | |
| 16 | Preamble |
| 17 | |
| 18 | The GNU Affero General Public License is a free, copyleft license for |
| 19 | software and other kinds of works, specifically designed to ensure |
| 20 | cooperation with the community in the case of network server software. |
| 21 | |
| 22 | The licenses for most software and other practical works are designed |
| 23 | to take away your freedom to share and change the works. By contrast, |
| 24 | our General Public Licenses are intended to guarantee your freedom to |
| 25 | share and change all versions of a program--to make sure it remains free |
| 26 | software for all its users. |
| 27 | |
| 28 | When we speak of free software, we are referring to freedom, not |
| 29 | price. Our General Public Licenses are designed to make sure that you |
| 30 | have the freedom to distribute copies of free software (and charge for |
| 31 | them if you wish), that you receive source code or can get it if you |
| 32 | want it, that you can change the software or use pieces of it in new |
| 33 | free programs, and that you know you can do these things. |
| 34 | |
| 35 | Developers that use our General Public Licenses protect your rights |
| 36 | with two steps: (1) assert copyright on the software, and (2) offer |
| 37 | you this License which gives you legal permission to copy, distribute |
| 38 | and/or modify the software. |
| 39 | |
| 40 | A secondary benefit of defending all users' freedom is that |
| 41 | improvements made in alternate versions of the program, if they |
| 42 | receive widespread use, become available for other developers to |
| 43 | incorporate. Many developers of free software are heartened and |
| 44 | encouraged by the resulting cooperation. However, in the case of |
| 45 | software used on network servers, this result may fail to come about. |
| 46 | The GNU General Public License permits making a modified version and |
| 47 | letting the public access it on a server without ever releasing its |
| 48 | source code to the public. |
| 49 | |
| 50 | The GNU Affero General Public License is designed specifically to |
| 51 | ensure that, in such cases, the modified source code becomes available |
| 52 | to the community. It requires the operator of a network server to |
| 53 | provide the source code of the modified version running there to the |
| 54 | users of that server. Therefore, public use of a modified version, on |
| 55 | a publicly accessible server, gives the public access to the source |
| 56 | code of the modified version. |
| 57 | |
| 58 | An older license, called the Affero General Public License and |
| 59 | published by Affero, was designed to accomplish similar goals. This is |
| 60 | a different license, not a version of the Affero GPL, but Affero has |
| 61 | released a new version of the Affero GPL which permits relicensing under |
| 62 | this license. |
| 63 | |
| 64 | The precise terms and conditions for copying, distribution and |
| 65 | modification follow. |
| 66 | |
| 67 | TERMS AND CONDITIONS |
| 68 | |
| 69 | 0. Definitions. |
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| 71 | "This License" refers to version 3 of the GNU Affero General Public License. |
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| 73 | "Copyright" also means copyright-like laws that apply to other kinds of |
| 74 | works, such as semiconductor masks. |
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| 76 | "The Program" refers to any copyrightable work licensed under this |
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| 171 | Conveying under any other circumstances is permitted solely under |
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| 175 | 3. Protecting Users' Legal Rights From Anti-Circumvention Law. |
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| 177 | No covered work shall be deemed part of an effective technological |
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| 193 | You may convey verbatim copies of the Program's source code as you |
| 194 | receive it, in any medium, provided that you conspicuously and |
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| 197 | non-permissive terms added in accord with section 7 apply to the code; |
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| 199 | recipients a copy of this License along with the Program. |
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| 201 | You may charge any price or no price for each copy that you convey, |
| 202 | and you may offer support or warranty protection for a fee. |
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| 204 | 5. Conveying Modified Source Versions. |
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| 206 | You may convey a work based on the Program, or the modifications to |
| 207 | produce it from the Program, in the form of source code under the |
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| 210 | a) The work must carry prominent notices stating that you modified |
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| 226 | d) If the work has interactive user interfaces, each must display |
| 227 | Appropriate Legal Notices; however, if the Program has interactive |
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| 231 | A compilation of a covered work with other separate and independent |
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| 236 | used to limit the access or legal rights of the compilation's users |
| 237 | beyond what the individual works permit. Inclusion of a covered work |
| 238 | in an aggregate does not cause this License to apply to the other |
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| 241 | 6. Conveying Non-Source Forms. |
| 242 | |
| 243 | You may convey a covered work in object code form under the terms |
| 244 | of sections 4 and 5, provided that you also convey the |
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| 293 | A "User Product" is either (1) a "consumer product", which means any |
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| 339 | 7. Additional Terms. |
| 340 | |
| 341 | "Additional permissions" are terms that supplement the terms of this |
| 342 | License by making exceptions from one or more of its conditions. |
| 343 | Additional permissions that are applicable to the entire Program shall |
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| 345 | that they are valid under applicable law. If additional permissions |
| 346 | apply only to part of the Program, that part may be used separately |
| 347 | under those permissions, but the entire Program remains governed by |
| 348 | this License without regard to the additional permissions. |
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| 350 | When you convey a copy of a covered work, you may at your option |
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| 403 | 8. Termination. |
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| 405 | You may not propagate or modify a covered work except as expressly |
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| 425 | Termination of your rights under this section does not terminate the |
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| 429 | material under section 10. |
| 430 | |
| 431 | 9. Acceptance Not Required for Having Copies. |
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| 433 | You are not required to accept this License in order to receive or |
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| 435 | occurring solely as a consequence of using peer-to-peer transmission |
| 436 | to receive a copy likewise does not require acceptance. However, |
| 437 | nothing other than this License grants you permission to propagate or |
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| 442 | 10. Automatic Licensing of Downstream Recipients. |
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| 444 | Each time you convey a covered work, the recipient automatically |
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| 449 | An "entity transaction" is a transaction transferring control of an |
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| 467 | 11. Patents. |
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| 469 | A "contributor" is a copyright holder who authorizes use under this |
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| 473 | A contributor's "essential patent claims" are all patent claims |
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| 488 | In the following three paragraphs, a "patent license" is any express |
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| 495 | If you convey a covered work, knowingly relying on a patent license, |
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| 499 | then you must either (1) cause the Corresponding Source to be so |
| 500 | available, or (2) arrange to deprive yourself of the benefit of the |
| 501 | patent license for this particular work, or (3) arrange, in a manner |
| 502 | consistent with the requirements of this License, to extend the patent |
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| 515 | work and works based on it. |
| 516 | |
| 517 | A patent license is "discriminatory" if it does not include within |
| 518 | the scope of its coverage, prohibits the exercise of, or is |
| 519 | conditioned on the non-exercise of one or more of the rights that are |
| 520 | specifically granted under this License. You may not convey a covered |
| 521 | work if you are a party to an arrangement with a third party that is |
| 522 | in the business of distributing software, under which you make payment |
| 523 | to the third party based on the extent of your activity of conveying |
| 524 | the work, and under which the third party grants, to any of the |
| 525 | parties who would receive the covered work from you, a discriminatory |
| 526 | patent license (a) in connection with copies of the covered work |
| 527 | conveyed by you (or copies made from those copies), or (b) primarily |
| 528 | for and in connection with specific products or compilations that |
| 529 | contain the covered work, unless you entered into that arrangement, |
| 530 | or that patent license was granted, prior to 28 March 2007. |
| 531 | |
| 532 | Nothing in this License shall be construed as excluding or limiting |
| 533 | any implied license or other defenses to infringement that may |
| 534 | otherwise be available to you under applicable patent law. |
| 535 | |
| 536 | 12. No Surrender of Others' Freedom. |
| 537 | |
| 538 | If conditions are imposed on you (whether by court order, agreement or |
| 539 | otherwise) that contradict the conditions of this License, they do not |
| 540 | excuse you from the conditions of this License. If you cannot convey a |
| 541 | covered work so as to satisfy simultaneously your obligations under this |
| 542 | License and any other pertinent obligations, then as a consequence you may |
| 543 | not convey it at all. For example, if you agree to terms that obligate you |
| 544 | to collect a royalty for further conveying from those to whom you convey |
| 545 | the Program, the only way you could satisfy both those terms and this |
| 546 | License would be to refrain entirely from conveying the Program. |
| 547 | |
| 548 | 13. Remote Network Interaction; Use with the GNU General Public License. |
| 549 | |
| 550 | Notwithstanding any other provision of this License, if you modify the |
| 551 | Program, your modified version must prominently offer all users |
| 552 | interacting with it remotely through a computer network (if your version |
| 553 | supports such interaction) an opportunity to receive the Corresponding |
| 554 | Source of your version by providing access to the Corresponding Source |
| 555 | from a network server at no charge, through some standard or customary |
| 556 | means of facilitating copying of software. This Corresponding Source |
| 557 | shall include the Corresponding Source for any work covered by version 3 |
| 558 | of the GNU General Public License that is incorporated pursuant to the |
| 559 | following paragraph. |
| 560 | |
| 561 | Notwithstanding any other provision of this License, you have |
| 562 | permission to link or combine any covered work with a work licensed |
| 563 | under version 3 of the GNU General Public License into a single |
| 564 | combined work, and to convey the resulting work. The terms of this |
| 565 | License will continue to apply to the part which is the covered work, |
| 566 | but the work with which it is combined will remain governed by version |
| 567 | 3 of the GNU General Public License. |
| 568 | |
| 569 | 14. Revised Versions of this License. |
| 570 | |
| 571 | The Free Software Foundation may publish revised and/or new versions of |
| 572 | the GNU Affero General Public License from time to time. Such new versions |
| 573 | will be similar in spirit to the present version, but may differ in detail to |
| 574 | address new problems or concerns. |
| 575 | |
| 576 | Each version is given a distinguishing version number. If the |
| 577 | Program specifies that a certain numbered version of the GNU Affero General |
| 578 | Public License "or any later version" applies to it, you have the |
| 579 | option of following the terms and conditions either of that numbered |
| 580 | version or of any later version published by the Free Software |
| 581 | Foundation. If the Program does not specify a version number of the |
| 582 | GNU Affero General Public License, you may choose any version ever published |
| 583 | by the Free Software Foundation. |
| 584 | |
| 585 | If the Program specifies that a proxy can decide which future |
| 586 | versions of the GNU Affero General Public License can be used, that proxy's |
| 587 | public statement of acceptance of a version permanently authorizes you |
| 588 | to choose that version for the Program. |
| 589 | |
| 590 | Later license versions may give you additional or different |
| 591 | permissions. However, no additional obligations are imposed on any |
| 592 | author or copyright holder as a result of your choosing to follow a |
| 593 | later version. |
| 594 | |
| 595 | 15. Disclaimer of Warranty. |
| 596 | |
| 597 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY |
| 598 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT |
| 599 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY |
| 600 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, |
| 601 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 602 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM |
| 603 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF |
| 604 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
| 605 | |
| 606 | 16. Limitation of Liability. |
| 607 | |
| 608 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
| 609 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS |
| 610 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY |
| 611 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE |
| 612 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF |
| 613 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD |
| 614 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), |
| 615 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF |
| 616 | SUCH DAMAGES. |
| 617 | |
| 618 | 17. Interpretation of Sections 15 and 16. |
| 619 | |
| 620 | If the disclaimer of warranty and limitation of liability provided |
| 621 | above cannot be given local legal effect according to their terms, |
| 622 | reviewing courts shall apply local law that most closely approximates |
| 623 | an absolute waiver of all civil liability in connection with the |
| 624 | Program, unless a warranty or assumption of liability accompanies a |
| 625 | copy of the Program in return for a fee. |
| 626 | |
| 627 | END OF TERMS AND CONDITIONS |
| 628 | |
| 629 | How to Apply These Terms to Your New Programs |
| 630 | |
| 631 | If you develop a new program, and you want it to be of the greatest |
| 632 | possible use to the public, the best way to achieve this is to make it |
| 633 | free software which everyone can redistribute and change under these terms. |
| 634 | |
| 635 | To do so, attach the following notices to the program. It is safest |
| 636 | to attach them to the start of each source file to most effectively |
| 637 | state the exclusion of warranty; and each file should have at least |
| 638 | the "copyright" line and a pointer to where the full notice is found. |
| 639 | |
| 640 | <one line to give the program's name and a brief idea of what it does.> |
| 641 | Copyright (C) <year> <name of author> |
| 642 | |
| 643 | This program is free software: you can redistribute it and/or modify |
| 644 | it under the terms of the GNU Affero General Public License as published by |
| 645 | the Free Software Foundation, either version 3 of the License, or |
| 646 | (at your option) any later version. |
| 647 | |
| 648 | This program is distributed in the hope that it will be useful, |
| 649 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 650 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 651 | GNU Affero General Public License for more details. |
| 652 | |
| 653 | You should have received a copy of the GNU Affero General Public License |
| 654 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 655 | |
| 656 | Also add information on how to contact you by electronic and paper mail. |
| 657 | |
| 658 | If your software can interact with users remotely through a computer |
| 659 | network, you should also make sure that it provides a way for users to |
| 660 | get its source. For example, if your program is a web application, its |
| 661 | interface could display a "Source" link that leads users to an archive |
| 662 | of the code. There are many ways you could offer source, and different |
| 663 | solutions will be better for different programs; see section 13 for the |
| 664 | specific requirements. |
| 665 | |
| 666 | You should also get your employer (if you work as a programmer) or school, |
| 667 | if any, to sign a "copyright disclaimer" for the program, if necessary. |
| 668 | For more information on this, and how to apply and follow the GNU AGPL, see |
| 669 | <http://www.gnu.org/licenses/>. |
| 670 | |
| 671 | |
| 672 | Linking Exception |
| 673 | |
| 674 | Linking this library statically or dynamically with other modules is making a |
| 675 | combined work based on this library. Thus, the terms and conditions of the GNU |
| 676 | Affero General Public License cover the whole combination. |
| 677 | |
| 678 | As a special exception, the copyright holders of this library give you |
| 679 | permission to link this library with independent modules to produce an |
| 680 | executable, regardless of the license terms of these independent modules, |
| 681 | and to copy and distribute the resulting executable under terms of your choice, |
| 682 | provided that you also meet, for each linked independent module, the terms |
| 683 | and conditions of the license of that module. An independent module is a |
| 684 | module which is not derived from or based on this library. If you modify |
| 685 | this library, you may extend this exception to your version of the library, |
| 686 | but you are not obligated to do so. If you do not wish to do so, delete this |
| 687 | exception statement from your version. |
| 688 | |
| 689 | As such, it can be used to run, create and distribute a large class of |
| 690 | MindAgents and other applications. When OpenCog is used unmodified as the core |
| 691 | class library for an OpenCog instance, compiler for the combo language, or for |
| 692 | a program written in the combo programming language it does not affect the |
| 693 | licensing for distributing those programs directly. |