Data reproducing apparatus and method

A playback device and data technology, applied in data recording, digital recording/reproducing, television, etc., can solve problems such as inability to effectively detect digital watermark information, and achieve the effects of reducing loading processing, reliable copy protection, and preventing illegal copying
CN1438641AInactive Publication Date: 2003-08-27SONY CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SONY CORP
Publication Date
2003-08-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

A data playback apparatus for playing back a recording medium in which a signal having digital watermark information embedded therein is recorded, the digital watermark information including copy control information, includes a reading unit, a signal detection unit, and a digital watermark information detection unit. The reading unit reads a signal from the recording medium. The signal detection unit determines whether or not the signal read by the reading means is the signal having digital watermark information embedded therein. When the start of the signal having digital watermark information embedded therein is detected by the signal detection unit, the digital watermark information detection unit detects the digital watermark information using the detected start as a trigger.
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Description

technical field

[0001] The present invention relates to a signal playback control technology for a medium containing digital watermark information including copy control information for preventing illegal copying. Background technique

[0002] Recently, recording media such as DVD (Digital Versatile Disc) can record a large amount of video information as digital data, and, for example, video information corresponding to one movie can be recorded on a single recording medium. With the ability to record information such as video information as digital information, it has become increasingly important to provide copyright holders with techniques to prevent illegal copying.

[0003] A technique for preventing illegal copying of video information has been disclosed in, for example, Japanese Unexamined Patent Application Publication No. 11-155125. In the technology disclosed in this publication number, when the copy control information discriminated from the digital watermark inf...

Claims

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