Grandstream Networks GRP2601 Administration Manual page 7

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 Grandstream web site from:
http://www.grandstream.com/sites/default/files/Resources/grp_gpl_color.tar.gz
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GRP260x Administration Guide
Version 1.0.1.18