/* $Id: license.pl,v 1.3 2004/09/21 14:22:23 jan Exp $ Part of SWI-Prolog Author: Jan Wielemaker E-mail: jan@swi.psy.uva.nl WWW: http://www.swi-prolog.org Copyright (C): 1985-2002, University of Amsterdam This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA As a special exception, if you link this library with other files, compiled with a Free Software compiler, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ :- module(license, [ license/1, % +LicenseId license/2, % +LicenseId, +ModuleId eval_license/0 % Eval current situation ]). :- dynamic licensed/2. % +Id, +Module :- multifile license/3. /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - License definitions. This data is (still incomplete) taken from http://www.fsf.org/licenses/license-list.html. The first argument is the license identifier. The second tells us with which of the two principal licenses (GPL and LGPL) the license is compatible. The remainder is a list of properties that can be used with more high-level license-information tools. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ license(gpl, gpl, [ comment('GNU General Public License'), url('http://www.fsf.org/copyleft/gpl.html') ]). license(lgpl, lgpl, [ comment('GNU Lesser General Public License'), url('http://www.fsf.org/copyleft/lesser.html') ]). license(swipl, lgpl, [ comment('SWI-Prolog Prolog Source License'), url('http://www.swi-prolog.org/license.html') ]). % Other GPL/LGPL compatible licenses. license(guile, lgpl, [ comment('License for Guile') ]). license(gnu_ada, lgpl, [ comment('The license of the run-time units of the GNU Ada compiler') ]). license(x11, lgpl, [ comment('The X11 licens'), url('http://www.x.org/terms.htm') ]). license(expat, lgpl, [ comment('Expat license'), url('http://www.jclark.com/xml/copying.txt') ]). license(sml, lgpl, [ comment('Standard ML of New Jersey Copyright License'), url('http://cm.bell-labs.com/cm/cs/what/smlnj/license.html') ]). license(public_domain, lgpl, [ comment('Unrestricted Public domain') ]). license(cryptix, lgpl, [ comment('The Cryptix General License'), url('http://www.cryptix.org/docs/license.html') ]). license(bsd, lgpl, [ comment('The modified BSD license'), url('http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5') ]). license(zlib, gpl, [ comment('The license of ZLib'), url('http://www.gzip.org/zlib/zlib_license.html') ]). license(lgpl_compatible, lgpl, [ comment('Other LGPL compatible license') ]). license(gpl_compatible, gpl, [ comment('Other GPL and not LGPL compatible license') ]). % license(+License, [+ModuleId]) % % Register the current file under the given license restriction. license(License) :- ( prolog_load_context(file, File) -> true ; File = '' ), license(License, File). license(License, File) :- warn_if_unknown(License), assert(licensed(License, File)). warn_if_unknown(License) :- license(License, _, _), !. warn_if_unknown(License) :- print_message(warning, unknown_license(License)). % eval_license % % Report current license situation eval_license :- report_gpl, report_proprietary. report_gpl :- setof(Module, gpled(Module), Modules), !, print_message(informational, license(gpl, Modules)). report_gpl :- print_message(informational, license(lgpl)). gpled(Module) :- licensed(X, Module), license(X, gpl, _). report_proprietary :- ( setof(Module, proprietary(Module, L), Modules), print_message(informational, license(proprierary(L), Modules)), fail ; true ). proprietary(Module, L) :- licensed(L, Module), license(L, C, _), C \== gpl, C \== lgpl. /******************************* * MESSAGES * *******************************/ :- multifile prolog:message/3. prolog:message(unknown_license(License)) --> [ 'Unknown license: ~w. Known licenses are:'-[License], nl ], license_list. prolog:message(license(gpl, Modules)) --> [ 'This system may only distributed using the GNU General Public License', nl, 'because the following components contain GPL-ed code:', nl, nl ], file_list(Modules), see_also. prolog:message(license(lgpl)) --> [ 'This program may be distributed under any license, provided all', nl, 'conditions implied by the GNU Lesser General Public License', nl, 'are satisfied. In particular, this implies the source code', nl, 'to any modification in SWI-Prolog or one of the used libraries', nl, 'must be made available.', nl ], see_also. prolog:message(license(proprierary(L), Modules)) --> { license(L, _, Att) }, { memberchk(comment(C), Att) -> true ; C = L }, [ nl, 'The program contains modules covered by the "~w" license'-[C], nl ], ( { memberchk(url(URL), Att) } -> [ 'See ~w'-[URL], nl ] ; [] ), [ nl ], file_list(Modules). see_also --> [ nl, 'See http://www.swi-prolog.org/license.html for details on', nl, 'SWI-Prolog licensing policies supporting both free and non-free',nl, 'Software.' ]. license_list --> { findall(X, license(X, _, _), Pairs) }, license_list(Pairs). license_list([]) --> []. license_list([L|T]) --> { license(L, _, Att) }, ( { memberchk(comment(C), Att) ; memberchk(url(C), Att) } -> [ ' ~w~t16~|~w'-[X, C], nl ] ; [ ' ~w'-[X, C], nl ] ), license_list(T). file_list([]) --> []. file_list([H|T]) --> [ ' ~w'-[H], nl ], file_list(T).