Sony Corporation

Other

Teruyoshi Komuro

Tomoyuki Asano

Yoshitomo Osawa

Ryuji Ishiguro

Hisato Shima

Naofumi Yanagihara

Harumi Kawamura

Ichiro Hamada

Takehiko Nakano

Mari Horiguchi

Yasuhiro Takada

The CGMS unacceptable recorder accepts transmission frames only when the copyright protection information in a transmission header transmitted to the IEEE1394 serial bus indicates copy free. The CGMS acceptable recorder accepts transmission frames when the copyright protection information in the transmission header indicates copy free. When the copyright protection information in the transmission header indicates compliance with the copyright information contained in the content of the transmission frame, the copyright information in the content is fetched based on the signal format type information of the transmission header. As described herein above, a copy management information changeable apparatus such as a computer cannot accept data other than copy free signals from the digital interface.

Digital recording apparatus and copyright protection method thereof

A cipher key is generated by first information shared in secrete between a data transmitting unitand a data receiving unit, second information derived from duplication control information of transmit data and third information which is time change information shared between the data transmitting unit and the data receiving unit to cipher data by a CPUby using the above-mentioned cipher key to transmit, from the data transmitting unitto the data receiving unit, transmit data in which the duplication control information and the time change information are added to the ciphered data.

Data transmission system

Based on the detailed reproduction control information defining the reproduction control state of data to be transmitted, the CPUof the data transmission apparatus creates a simplified reproduction control information roughly defining the reproduction control state of the data, stores the simplified reproduction control information of the data in the packet header of a data packet carrying the data, stores the detailed reproduction control information in the data, and transmits the simplified reproduction control information and the detailed reproduction control information as well as the data to the data receiving apparatusthrough the transmission channelfrom the input-output interfaceThe CPUof the data receiving apparatusanalyses the reproduction control state of the data contained in the data packet based on the simplified reproduction information and the detailed reproduction information contained in the data packet, and controls the reproduction of the data by the action of the media access partaccording to the analysis result.

Copy protection using detailed copy control information

Based on the detailed reproduction control information defining the reproduction control state of data to be transmitted, the CPUof the data transmission apparatus creates a simplified reproduction control information roughly defining the reproduction control state of the data, stores the simplified reproduction control information of the data in the packet header of a data packet carrying the data, stores the detailed reproduction control information in the data, and transmits the simplified reproduction control information and the detailed reproduction control information as well as the data to the data receiving apparatusthrough the transmission channelfrom the input-output interface. The CPUof the data receiving apparatusanalyses the reproduction control state of the data contained in the data packet based on the simplified reproduction information and the detailed reproduction information contained in the data packet, and controls the reproduction of the data by the action of the media access partaccording to the analysis result.

The CGMS unacceptable recorder accepts transmission frames only when the copyright protection information in a transmission header transmitted to the IEEE1394 serial bus indicates copy free. The CGMS acceptable recorder accepts transmission frames when the copyright protection information in the transmission header indicates copy free. When the copyright protection information in the transmission header indicates compliance with the copyright information contained in the content of the transmission frame, the copyright information in the content is fetched based on the signal format type information of the transmission header. A copy management information changeable apparatus such as a computer cannot accept data other than copy free signals from the digital interface.

A cipher key is generated by first information shared in secrete between a data transmitting unitand a data receiving unitsecond information derived from duplication control information of transmit data and third information which is time change information shared between the data transmitting unit and the data receiving unit to cipher data by a CPUby using the above-mentioned cipher key to transmit, from the data transmitting unitto the data receiving unittransmit data in which the duplication control information and the time change information are added to the ciphered data.

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Kanagawa, Japan

Teruyoshi Komuro