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) 2019-2024 Daniel Kochmański and Marius Gerbershagen
Copyright (c) 2015-2018, Daniel Kochmański
Copyright (c) 2000-2013, 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
PLEASE NOTE THAT:
This license covers all of the ECL program except for the files
src/lsp/loop.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
examples/ ; Examples for the ECL usage
Look the precise copyright of these extensions in the corresponding
files.
Examples are licensed under: (SPDX-License-Identifier) BSD-2-Clause
Report bugs, comments, suggestions to the ecl mailing list:
ecl-devel@common-lisp.net.
---- END OF COPYRIGHT FOR THE ECL CORE ENVIRONMENT ------------------
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with the no Front-Cover Texts, and with no Back-Cover Texts. Exact text of the license is available at https://www.gnu.org/copyleft/fdl.html.