Kyocera Corporation

Kddi Corporation

Nippon Hoso' Kyokai

Shuichi Sugie

Tatsuo Shibata

Masaru Fukushima

Shinsaku Kiyomoto

Takeshi Kimura

Keigo Majima

Go Ohtake

Hideki Kokubun

A broadcast receiving apparatus comprises a broadcast receiving unit () for receiving a digital broadcast; a communication unit () for performing two-way communication through a network; an operation unitfor performing an acquisition operation of a key for decrypting an encrypted broadcast program received by the broadcast receiving unit; and an address generating unitfor generating an address of an acquisition location of the key which is accessible with the communication unit, by using program arrangement information corresponding to the broadcast program based on the acquisition operation of a key by the operation unit.

Address generating method and broadcast receiving apparatus

Provided is a system far receiving a initialization packet containing an initial vector for initializing stream encryption algorithm and an identifier of a key for decrypting an encrypted stream, initializing a decryption module, and decrypting the encrypted stream, wherein the system stores an identifier of a key which is needed to decrypt a next program in a initialization packet of a current program and informs a user of whether a desired key has been acquired or not at timing close to start time of the next program.

Stream generation method, broadcast receiving apparatus, and display method

Growing community of inventors

Tokyo, Japan

Shuichi Sugie