Owner Sony Corporation

Inventors Sako, Yoichiro; Inokuchi, Tatsuya

Agent Griffith Hack

Pub. Number AU-B-2004200930

Parent 13098

Filing date 4 March 2004

Wipo publication date 1 April 2004

Acceptance publication date 17 August 2006

G11B 20/10 (2006.01) Signal processing not specific to the method of recording or reproducing - Digital recording or reproducing

G06F 12/14 (2006.01) Accessing, addressing or allocating within memory systems or architectures - Protection against unauthorised use of memory

G09C 5/00 (2006.01) Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages

G11B 7/004 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power

G11B 19/02 (2006.01) Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor - Control of operating function, e.g. switching from recording to reproducing

H04L 9/32 (2006.01) Arrangements for secret or secure communication - including means for verifying the identity or authority of a user of the system