SWI-Prolog LICENCE (Clarified 6 August 1990) Copyright (C) 1990 Jan Wielemaker, University of Amsterdam. Everyone is permitted to copy and distribute verbatim copies of this licence, but changing it is not allowed. You can also use this wording to make the terms for other programs. This licence is a based on (but not equal to) the General Public Licence of the Free Software Foundation. This licence agreement is intended to give anyone the right to share SWI-Prolog for non-commercial use. To make sure that you get the rights we want you to have, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. Hence this licence agreement. Specifically, we want to make sure that you have the right to give away copies of SWI-Prolog, that you receive source code or else can get it if you want it, that you can change SWI-Prolog or use pieces of it in new free programs, and that you know you can do these things. To make sure that everyone has such rights, we have to forbid you to deprive anyone else of these rights. For example, if you distribute copies of SWI-Prolog, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must give them a verbatim copy of this licence to tell them their rights. Also, for our own protection, we must make certain that everyone finds out that there is no warranty for SWI-Prolog. If SWI-Prolog is modified by someone else and passed on, we want its recipients to know that what they have is not what we distributed, so that any problems introduced by others will not reflect on our reputation. Therefore we (Jan Wielemaker and the Department of Social Science Informatics (SWI) of the University of Amsterdam) make the following terms which say what you must do to be allowed to distribute or change SWI-Prolog. COPYING POLICIES 1. You may copy and distribute verbatim copies of the SWI-Prolog source code as you receive it, on any medium, provided that you conspicuously and appropriately publish on each copy a valid copyright notice "Copyright (C) 1990 Jan Wielemaker" and the author's address; keep intact the notices on all files that refer to this Licence Agreement and to the absence of any warranty; and give any other recipients of the SWI-Prolog program a copy of this Licence Agreement along with the program. You may charge a distribution fee for the physical act of transferring a copy. 2. You may modify your copy or copies of SWI-Prolog source code or any portion of it, and copy and distribute such modifications under the terms of Paragraph 1 above, provided that you also do the following: a) cause the modified files to carry prominent notices stating that you changed the files and the date of any change; and b) cause the whole of any work that you distribute or publish, that in whole or in part contains or is a derivative of SWI-Prolog or any part thereof, to be licensed at no charge to all third parties on terms identical to those contained in this Licence Agreement (except that you may choose to grant more extensive warranty protection to some or all third parties, at your option). c) if the modified program serves as an interactive Prolog system, cause it when started running in the simplest and usual way, to print an announcement including a valid copyright notice "Copyright (C) 1990 University of Amsterdam", and informing the user how to view a copy of this Licence Agreement. d) you may charge a distribution fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. Mere aggregation of another unrelated program with this program (or its derivative) on a volume of a storage or distribution medium does not bring the other program under the scope of these terms. 3. You may copy and distribute SWI-Prolog (or a portion or derivative of it, under Paragraph 2) in object code or executable form under the terms of Paragraphs 1 and 2 above provided that you also do one of the following: a) accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Paragraphs 1 and 2 above; or, b) accompany it with a written offer, valid for at least three years, to give any third party free (except for a nominal shipping charge) a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Paragraphs 1 and 2 above; or, c) accompany it with the information you received as to where the corresponding source code may be obtained. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form alone.) For an executable file, complete source code means all the source code for all modules it contains; but, as a special exception, it need not include source code for modules which are standard libraries that accompany the operating system on which the executable file runs. 4. You may not copy, sublicense, distribute or transfer SWI-Prolog except as expressly provided under this Licence Agreement. Any attempt otherwise to copy, sublicense, distribute or transfer SWI-Prolog is void and your rights to use SWI-Prolog under this Licence Agreement shall be automatically terminated. However, parties who have received computer software programs from you with this Licence Agreement will not have their licences terminated so long as such parties remain in full compliance. 5. If you wish to incorporate parts of SWI-Prolog into other programs or distribute Prolog programs running on SWI-Prolog whose distribution conditions are different, contact the author. We have not yet worked out a simple rule that can be stated here, but we will often permit this. 6. If you base research on SWI-Prolog and publish on this research, you must include appropriate acknowledgements and references to SWI-Prolog in your publication. Your comments and suggestions about our licensing policies and this software are welcome! Please contact the author, Jan Wielemaker, Social Science Informatics (SWI), University of Amsterdam, Roetersstraat 15 1018 WB Amsterdam, The Netherlands. E-mail: jan@swi.psy.uva.nl NO WARRANTY BECAUSE SWI-PROLOG IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING, THE UNIVERSITY OF AMSTERDAM, JAN WIELEMAKER AND/OR OTHER PARTIES PROVIDE SWI-PROLOG "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE SWI-PROLOG PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL THE UNIVERSITY OF AMSTERDAM, JAN WIELEMAKER, AND/OR ANY OTHER PARTY WHO MAY MODIFY AND REDISTRIBUTE SWI-PROLOG AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES, OR OTHER SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH PROGRAMS NOT DISTRIBUTED BY THE UNIVERSITY BY OF AMSTERDAM) THE PROGRAM, EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. ======================================================================== Notification of Acceptance of the SWI-Prolog Licence Agreement I have read the SWI-Prolog licence agreement and understand the conditions of this licence and the no-warranty terms. Any act conflicting with this licence agreement makes the agreement void. Name:___________________________________________ Institution:____________________________________ Address:________________________________________ ________________________________________ ________________________________________ E-mail: _____________________ I obtained a copy of SWI-Prolog from: _________________________________ This copy is: O An unmodified version O A modified version If it concerns a modified version: Author(s) that implemented the modifications: _______________________________________________________________ Description of the modifications: _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ I would like to be noticed of new releases and bug fixes O yes (Notification is only possible by E-mail) O no I will mainly be using SWI-Prolog for (curiosity only; you do not have to answer this question): O Research in logic programming O Research in Prolog environments O Teaching Prolog O Other: _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Return this form to by E-mail or surface mail to: Jan Wielemaker Social Science Informatics (SWI) Herengracht 196 1016 BS Amsterdam The Netherlands E-mail: jan@swi.psy.uva.nl