Sony Corporation

Asako Fujii

Teruhiko Kori

Jun Hirai

Ichiro Hamada

To enable usage of content at a receiver which does not have a copying function even if copyright protection is provided. Model names of receivers not having a function enabling copying of content are held in an authentication processing circuit () of a transmitter (). When a model name obtained from a connected receiver () is held, regardless of whether the content is copyright protected, a signal selection circuit () selects a terminal a side, a switch () is turned on, and an unencrypted signal is transmitted. When a change of the receiver () is detected by a hot plug detection function or a plug and play function at a processing circuit () during the transfer of a signal of copyright protected content without providing copyright protection, the selection circuit () is made to select a terminal b side or the switch () is turned off to suspend the transfer of the non-copyright protected signal. The information indicating the receiver is held in a tamper-proof updateable manner.

Transmitter, signal transfer method, data distribution system and method of same, data receiver, data provider and method of same, and data transferer

To enable usage of content at a receiver which does not have a copying function even if copyright protection is provided. Model names of receivers not having a copying funtion are held in an authentication processing circuit of a transmitter. When a model name obtained from a connected receiver is held, regardless of whether the content is copyright protected, a signal selection circuit selects a terminal a side, a switch is turned on, and an unencrypted signal is transmitted. When a change of the receiver is detected by a hot plug detection or plug and play function at a processing circuit during the signal transfer of copyright protected content without providing copyright protection, the selection circuit selects a terminal b side or the switch is turned off to suspend the transfer of the non-copyright protected signal. The information indicating the receiver is held in a tamper-proof updateable manner.

Transmitter, signal transmitting method, and data distributing system for transferring a content signal or processing copyright protection on a content signal

In an information processing apparatus, a key management unit forms a judgment as to whether an authentication key owned by an application program is valid or invalid. A content protection unit is controlled based on this determination so that contents are exchanged between the information processing apparatus and the application program. An encryption/decryption unit encrypts a decrypted content by using an encryption key received from a key management unit and outputs the encrypted content to an encrypted-information addition unit. The encrypted-information addition unit adds encrypted information to the encrypted content received from the encryption/decryption unit and outputs the encrypted content with the encrypted information added thereto to the application program. As a result, it is possible to prevent content from being utilized illegally.

Information processing apparatus, information processing method and providing medium

When an input signal is signal-converted and is output, the copyright of a signal to be signal-converted is reliably protected. In an additional information detection/determination section, digital watermark information, CGMS information, etc., which are superposed on or added to an input luminance signal, are detected, and it is determined whether or not a signal which is to be signal-converted in a signal conversion section should be output on the basis of the detected additional information. When additional information for prohibiting or limiting copying has been superposed on or added to the input luminance signal, a switching circuit for output control is turned off so that the signal which is signal-converted in the signal conversion section is not output to the outside.

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New York, NY, United States of America

Asako Fujii