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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

Inactive Publication Date: 2003-08-27
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a device without a data storage unit will not be able to effectively detect digital watermark information

Method used

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  • Data reproducing apparatus and method
  • Data reproducing apparatus and method
  • Data reproducing apparatus and method

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Embodiment Construction

[0031] The present invention discloses a data reproducing device (information reproducing device) for reproducing a recording medium in which digital watermark information is recorded as an embedded signal, the digital watermark information including copy control for preventing illegal copying information. The present invention is suitable for application to random access data playback devices to detect digital watermark information embedded in a bit stream (or data stream) or to obtain copy control or playback control based on copy control information included in the digital watermark information. In the present invention, various recording media including disc-shaped recording media, tape-shaped recording media, and semiconductor memories can be used. Copy control information (or copy management information) contains information requested for copy control or playback control, such as copy permission information, copy prohibition information, and copy restriction information....

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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.

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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Application Information

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IPC IPC(8): H04N5/76G11B20/00G11B20/10H04N5/85H04N5/907H04N5/91H04N5/913H04N7/08H04N7/081H04N9/804
CPCH04N2005/91335H04N5/85G11B20/00086H04N2005/91364H04N5/913H04N21/23476H04N2005/91328H04N9/8042H04N5/907G11B20/00884G11B20/10
Inventor 木谷聪
Owner SONY CORP
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