SWI Prolog license
When I firstly packaged SWI Prolog in the pre-DFSG era I decided to put
it out of main distribution because I thought it wasn't entirely free.
However I checked the license against DFSG now and I think SWI Prolog is
DFSG compliant. I can't remember my doubts from the packaging time.
Probably the sentence "This licence agreement is intended to give anyone
the right to share SWI-Prolog for non-commercial use.", however this
doesn't avoid commercial use in fact. Also the paragraphs 5. and 6. of
the license don't violate DFSG in any way, I think.
Could someone please check I'm right and that SWI Prolog can be moved
from non-free to main? Thanks.
Milan Zamazal
===============================================================================
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
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