Patent ID: 8774414

Claim:
A broadcast (BCAST) Service Distribution/Adaptation (BSD/A) unit in a mobile broadcast system providing a BCAST, the BSD/A unit comprising: a transmitter circuit configured to transmit a Registration Key Material (RKM) request message for requesting delivery of an RKM for registration of the BCAST service of a terminal to a BCAST Subscription Management (BSM) unit managing subscriber information of the terminal; and a receiver circuit configured to receive an RKM request response message from the BSM unit, wherein the RKM request message includes an identifier (ID) of the BCAST service, and the RKM request response message includes the ID of the BCAST service and the RKM, wherein the transmitter circuit is configured to transmit a Long-Term Key Message (LTKM) request message for requesting delivery of an LTKM provided to the terminal during subscription of the BCAST service to the BSM unit, wherein the receiver circuit is configured to receive an LTKM request response message from the BSM unit, wherein the LTKM request message includes the ID of the BCAST service, and the LTKM request response message includes the ID of the BCAST service and the LTKM, wherein the transmitter circuit is configured to transmit a Short-Term Key Message (STKM) request message for acquisition of an STKM including a Traffic Encryption Key (TEK) used for decryption of the BCAST service by the terminal to the BSM unit, wherein the receiver circuit is configured to receive an STKM request response message from the BSM unit, and wherein the STKM request message includes the ID of the BCAST service, and the STKM request response message includes the ID of the BCAST service and the STKM.