Apparatus and method for preventing unauthorized copying of video signals

a video signal and copying technology, applied in the field of video signal copying prevention, can solve the problems of copying a significant threat to the interests of those owning the rights to program information, and the protection system of digital vtrs is not effectiv

Inactive Publication Date: 2000-07-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Accordingly, it is an object of the present invention to provide a method and apparatus for p...

Problems solved by technology

The previously proposed copy protection systems for digital VTRs are not effective to prevent a digital VTR from recording a signal received in analog form, and the...

Method used

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  • Apparatus and method for preventing unauthorized copying of video signals
  • Apparatus and method for preventing unauthorized copying of video signals
  • Apparatus and method for preventing unauthorized copying of video signals

Examples

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Embodiment Construction

An embodiment of the present invention will now be described with reference to FIG. 1. FIG. 1 shows, in block form, a reproducing section 31 of a first digital VTR and a recording section 32 of a second digital VTR. In particular, FIG. 1 shows the portions of the reproducing section 31 needed for outputting analog signals, and the portions of recording section 32 needed for making a digital recording from analog input signals.

Reproducing section 31 includes an analog audio output terminal 11 and an analog video output terminal 12. Reproducing section 32 includes an analog audio input terminal 13 and an analog video input terminal 14. As shown in FIG. 1, the audio output terminal 11 of reproducing section 31 is connected to the audio input terminal 13 of recording section 32, and the video output terminal 12 of reproducing section 31 is connected to the video input terminal 14 of recording section 32.

Reproducing section 31 includes a magnetic tape 1 on which a digital video signal ha...

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PUM

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Abstract

In a digital video tape recorder (VTR) which reproduces digital video and audio signals from a magnetic tape, a copy protect bit in the reproduced digital video signal is detected, and on the basis of the copy protect bit, a code is generated and inserted into the vertical blanking interval of the reproduced video signal. When a video signal (which may be in analog or digital form) having the code in the vertical blanking interval is received in a digital VTR, the code is detected and recording of the video signal and an associated audio signal is inhibited if the code indicates that the received video signal is copy protected.

Description

BACKGROUND OF THE INVENTIONThis invention relates to a method and apparatus for preventing copying of video signals which are intended to be copy protected and more particularly is directed to prevention of unauthorized copying of video signals transmitted or received by a digital video tape recorder (VTR).There has been proposed a VTR for consumer use in which program information in the form of a video signal and an associated audio signal are recorded in digital form on a magnetic tape. Digital recording of video signals and associated audio signals make it possible for such program information to be reproduced and copied (or "dubbed") onto another tape with little or no deterioration in the quality of the signal reproduced from the copy tape. These are times, however, when it is desirable to prevent such signals from being recorded. For example, in order to protect the rights of those holding a copyright in the recorded material, copyright protection schemes have been proposed in...

Claims

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Application Information

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IPC IPC(8): G11B33/12G11B20/00G11B27/031G11B17/28H04N7/087H04N7/088H04N5/913G06F21/10G11B15/087G11B20/10G11B27/032G11B27/28H04N5/7826H04N5/91H04N5/92H04N7/083
CPCG11B15/087G11B17/28G11B20/00086G11B20/00188G11B20/00195G11B20/0021G11B20/00246G11B20/00768G11B27/031G11B27/032G11B33/12G11B33/121H04N5/913H04N5/9206H04N7/088H04N7/0887G11B2220/20G11B2220/90H04N2005/91321H04N2005/91328H04N2005/91364
Inventor KANOTA, KEIJIINOUE, HAJIMEKUBOTA, YUKIO
Owner SONY CORP
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