Nippon Hoso' Kyokai

Satoshi Fujitsu

Yusei Nishimoto

Syunji Sunasaki

A low cost scramble key management apparatus which enables to manage a scramble key based on individual contract information and to ensure security in narrow band broadcasting. The scramble key management apparatusincludes an ECM decoding unitfor decoding an ECM in which a scramble key and individual contract information are encrypted. The individual contract information includes contract information indicating contract statuses of a plurality of content receivers, . . . which is arranged based on receiver IDs for identifying each of the content receivers. The scramble key management apparatusincludes a contract information obtaining unitfor obtaining the contract information of the content receiverassociated with the receiver ID from the individual contract information and a contract status determining unitfor determining the contract status and outputting the scramble key to a content decoderif the contract status is under contract.

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, method for license information output management, and license information management program

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Setagaya-ku, Japan

Satoshi Fujitsu