Digital content authentication system, and a video display device and a method for digital content authentication controlling applied thereto

The digital content authentication system, and a video display device and its digital content authentication controlling method applied thereto are provided. The video display device according to an embodiment of the present invention is, through the bus and requesting a verification result to the plurality of source providing device, an authentication result of the interface unit to receive a response to the request, and outputs an authentication result based on the received response an output unit which comprises. Thereby, it becomes possible to determine an authentication status of the source providing apparatus in a video display device. Digital content, HDMI, CEC channel, the bus structure, the certification status