Patent ID: 6373952
Filing Date: 2002-04-16
Classification: H04L

Abstract:
A data transmission apparatus connected to a first transmission system and a second transmission system and connected to at least one data reception apparatus for decoding a received encoded data by using a decoding key, the data transmission apparatus comprising:a key transmitting means for transmitting decoding key information for decoding encoded data and destination information associated with the encoded data to be transmitted to the first transmission system, to said data reception apparatus through the second transmission system, a generating means for adding first transmission control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted, to the data to be encoded and transmitted so as to generate transmitted data, an encoding means for encoding at least the transmission data based on encoding key information corresponding to the decoding key information to generate encoded data, and a data transmitting means for transmitting to the first transmission system the encoded data generated by the encoding means.