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https://www.grandstream.com/support/resources/
GNU GPL INFORMATION
GRP260x firmware contains third-party software licensed under the GNU General Public License (GPL). Grandstream uses
software under the specific terms of the GPL. Please see the GNU General Public License (GPL) for the exact terms and
conditions of the license.
Grandstream GNU GPL-related source code can be downloaded from the Grandstream website from:
http://www.grandstream.com/sites/default/files/Resources/grp260x_gnu_gpl.zip