ECL is distributed under the GNU LGPL, which allows for commercial uses of the software. A more precise description is given in the Copyright notice which is shipped with ECL.
---- BEGINNING OF COPYRIGHT FOR THE ECL CORE ENVIRONMENT ------------ Copyright (c) 2000, Juan Jose Garcia Ripoll Copyright (c) 1990, 1991, 1993 Giuseppe Attardi Copyright (c) 1984 Taiichi Yuasa and Masami Hagiya All Rights Reserved ECL is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version; see file 'Copying'. 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. PLEASE NOTE THAT: This license covers all of the ECL program except for the files src/lsp/loop2.lsp ; Symbolic's LOOP macro src/lsp/pprint.lsp ; CMUCL's pretty printer src/lsp/format.lsp ; CMUCL's format and the directories contrib/ ; User contributed extensions src/clx/ ; portable CLX library from Telent Look the precise copyright of these extensions in the corresponding files. Report bugs, comments, suggestions to the ecl mailing list: firstname.lastname@example.org. ---- END OF COPYRIGHT FOR THE ECL CORE ENVIRONMENT ------------------