SCRAMBLE KEY MANAGEMENT UNIT, SCRAMBLE KEY MANAGEMENT INFORMATION TRANSMITTING UNIT, METHOD FOR SCRAMBLE KEY OUTPUT MANAGEMENT, SCRAMBLE KEY MANAGEMENT PROGRAM, LICENSE INFORMATION MANAGEMENT UNIT, LICENSE MANAGEMENT INFORMATION TRANSMITTING UNIT, ME

摘要

To provide a low-cost scramble key management unit capable of managing a scramble key on the basis of individual contract information in narrowband broadcasting and providing a high level of safety. The scramble key management unit (7) is characterized by including ECM decoding means (scramble key management information decoding means) (75) that decodes an ECM containing an encrypted scramble key and encrypted individual contract information including contract information blocks, indicating contract states of a plurality of content receivers 3, 3, ..., arranged on the basis of receiver IDs for identifying the content receiver 3, contract information obtaining means (authorization information obtaining means) (76b) that obtains the contract information block of the corresponding content receiver 3 from the individual contract information on the basis of the associated receiver ID, and contract state determining means (authorization state determining means) (76c) that determines the contract state on the basis of the contract information block and outputs the scramble key to a content decoder (5) when determining that it is under contract.