Where can I find GNU GPL related source code?

You can find GNU GPL related source code below.

DP71x: Click to Download
DP720/750/760: Click to Download
GVC32xx: Click to Download
GXE502x: Click to Download
GXP2200: Click to Download
GXP11xx/GXP14xx/GXP21xx Series: Click to Download
GXP16XX Series: Click to Download
GXP17XX Series: Click to Download
GXP2130/2140/2160: Click to Download
GXV3140: Click to Download
GXV3175: Click to Download
GXV32XX: Click to Download
HT50x/GXW40xx Series: Click to Download
HT7xx Series: Click to Download
HT8xx Series: Click to Download
GAC2500: Click to Download
Surveillance GXV36xx/GXV35xx Series: Click to Download
GXW42xx Series: Click to Download

UCM6XXX Series:
– Boot_Kernel_UCM61XX_R1_0_11_27.zip
– Boot_Kernel_UCM62XX_UCM65XX_R1_0_11_27.zip
– 3rd_Party_Libraries_UCM6XXX_R1_0_11_27.zip
– Asterisk13_UCM6XXX_V1_0_11_27.zip
– DHADI_UCM6XXXX_R1_0_11_27.zip
– WebUI_UCM6XXX_V1_0_11_27.zip
– SVIP_UCM6XXX_1_0_11_27.zip

Where can I obtain a copy of the General Public License?

The General Public License can be downloaded here