Reproduction device stopping reproduction of encrypted...

Details Reproduction device stopping reproduction of encrypted... Reproduction device stopping reproduction of encrypted...

2006-03-07

2006-03-07

Morse, Gregory (Department: 2134)

Information security

Prevention of unauthorized use of data including prevention...

C380S201000

Reexamination Certificate

active

07010809

ABSTRACT:
A controller of a reproduction terminal determines whether a block read from a memory card is an encrypted block or a non-encrypted block, and then applies the read block to a content decrypting circuit. The controller stops supplying the block to the content decrypting circuit when a predetermined number of non-encrypted blocks are continuously read from the memory card. Consequently, reproduction of the encrypted content data can be stopped if the encrypted content data includes a continuous non-encrypted portion in which the number of non-encrypted blocks is equal to or larger than a predetermined non-zero number.

REFERENCES:
patent: 5805700 (1998-09-01), Nardone et al.
patent: 5951648 (1999-09-01), Kailash
patent: 2002/0016919 (2002-02-01), Sims
patent: 2000-047987 (2000-02-01), None
patent: 2000-261483 (2000-09-01), None
patent: 2002-007234 (2002-01-01), None

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