Signal recording medium, content signal generation...

Details Signal recording medium, content signal generation... Signal recording medium, content signal generation...

2006-02-21

2006-02-21

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Security kernel or utility

C713S166000, C713S167000, C713S152000, C713S152000

Reexamination Certificate

active

07003664

ABSTRACT:
A content signal having a control signal added thereto indicating whether a playback restricting function for restricting reproduction is activated is recorded on a disk. When an encryption key generation section determines at the time of reproduction that the content signal has the control signal added thereto indicating that the playback restricting function is activated, it is determined whether a playback permission condition is satisfied. The playback permission condition is read from the disk, or acquired via a communication section if it is not stored on the disk. A correct encryption key (Kp) is supplied to an encryption processing section only when the playback permission condition is satisfied. The encryption processing section decrypts the encrypted content signal recorded on the disk with the encryption key (Kp) and the correctly decrypted content signal is outputted from an output control section.

REFERENCES:
patent: 6212329 (2001-04-01), Sugahara

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