Matsushita Electric Industrial Co., Ltd.

Masaaki Takata

Yoshihiro Mori

Takashi Inoue

Katsuhiko Miwa

Noboru Katta

Hirotsugu Kawada

Keiichi Kameda

Tatsuya Suzuki

Hideaki Hatanaka

A recording apparatus records movie content onto a DVD. The movie content is encrypted using a different encryption method depending on whether the DVD is intended for consumer use or industrial use. If the DVD is for consumer use, a VIDEO_TS directory is created on the DVD, and the encrypted movie content is recorded in the VIDEO_TS directory. If the DVD is for industrial use, a VIDEO_TS directory and an EWCPS_TS directory are created on the DVD, and the encrypted movie content and message data are recorded respectively in the EWCPS_TS directory and the VIDEO_TS directory. The message data indicates that the movie content cannot be played back by consumer DVD players.

Recording method and apparatus, optical disk, and computer-readable storage medium

An object of this invention is to provide a method for processing signals for an optical disc device and an optical disc device for immediately determining the on-track state of a main beam light impinging on an optical disc including land areas on which information is recorded, said optical disc being track-formatted to have a double spiral structure. In recording or reproducing information on or from the land areas while track-controlling a first reflected light (MB) based on a second reflect light (SB,) and a third reflect light (SB,), the phases of a sum signal (SUM) and a difference signal (DIFF) between a first push-pull signal (PP,) obtained from an output from a first split photo conductor (,) and a second push-pull signal (PP,) obtained from an output from a second split photo conductor (,) are compared to determine from the mutual phase relationship which land area is providing the first reflected light (MB).

Method of processing signals for optical disc device and optical disc device utilizing two split photo detectors

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Hirakata, Japan

Masaaki Takata