ENCRYPTION KEY DISTRIBUTION METHOD IN MOBILE BROADCASTING SYSTEM AND SYSTEM FOR THE SAME

摘要

The present invention provides an encryption key distribution method for service protection and content protection in a mobile broadcasting system, and a system for the same. The encryption key distribution method according to the present invention includes the steps of: a network generating a first encryption key when a broadcasting service starts providing the service thereof; the network transmitting a universal rights object message containing discriminating information for discriminating the first encryption key generated in the previous step to a terminal; the network generating a second encryption key prior to the expiration of the lifetime of the first encryption key; and the network transmitting the universal rights object message containing discriminating information for discriminating the second encryption key generated in the previous step to the terminal.