Geographic Resources Analysis Support System (GRASS) is Copyright, 1999-2022 GRASS Development Team, and licensed under the terms of the GNU General Public License (GPL). This includes all software, documentation, and associated materials.
GRASS GIS is free and open source software, you can redistribute it and/or modify it under the terms of the GNU General Public License (>=v2) as published by the Free Software Foundation.
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 further details.
If you are not sure about the differences between public domain software, Free Software and proprietary products, have a look at this graphic describing categories of Free and Non-Free Software.
Questions regarding details of this policy can be directed to this email address.
See also the Frequently Asked Questions about the GNU GPL.