Patent ID: 6477708
Filing Date: 2002-11-05
Classification: H04N

Abstract:
A bidirectional communication system that performs bidirectional communication of video information including image and voice data, comprising:a plurality of client terminals, each of which transmits and receives the video information after sending a first and second service request messages over a communications network and having been granted authorization through a first and second authentication processes for the first and second service request messages, respectively; a broadcast server comprising a video data communication server to transmit and receive the video information to and from the client terminal of a requesting client whose identity has been successfully authenticated through the second authentication process, the video data communication server initiating the second authentication process by sending an authentication request message over the communication network in response to the second service request from the requesting client terminal; and a client management server to perform the first authentication process in response to the first service request message from the requesting client terminal, and to perform the second authentication process in response to the authentication request message from the video data communication server.