DECODING METHOD - VICTOR COMPANY OF JAPAN

Title:

DECODING METHOD

Document Type and Number:

Japanese Patent JP2002287624

Kind Code:

A

Abstract:

To permit a viewer to view contents only once at time when the viewer desires to view on the contents of 'No copy'.

The seed of a password key for ciphering a prescribed unit block is based on the password key when a unit block before the prescribed block is ciphered in a reproduction order. The head of the unit block is at least one of GOP of an MPEG video, one audio frame of an MPEG audio, the PES packet of an MPEG system layer, the TS packet group of the MPEG system layer, an information group recorded in one track of a tape medium, an information group recorded in one sector of a disk medium and an information group recorded in the ECC block of a medium constituting ECC.

More Like This:

WO/2001/044949	COMPUTERISED DEVICE FOR ACCREDITING DATA APPLICATION TO A SOFTWARE OR A SERVICE
WO/2001/096989	PROTECTING AUDIO DATA BY PROOF OF THE EXISTENCE OF A COMPLETE DATA SET USING WATERMARKING

Inventors:

SUGAWARA TAKAYUKI
UEDA KENJIRO
IBA WATARU
HIGURE SEIJI
KUROIWA TOSHIO

Application Number:

JP2001089549A

Publication Date:

October 04, 2002

Filing Date:

March 27, 2001

Export Citation:

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Assignee:

VICTOR COMPANY OF JAPAN

International Classes:

G06F12/14; G06F21/10; G06F21/60; G06F21/62; G09C1/00; G11B20/10; G11B20/12; H04N5/91; (IPC1-7): G09C1/00; G06F12/14; G11B20/10; G11B20/12; H04N5/91

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