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Recording method, reproducing method, reproducing device and recording medium

A recording method and replay technology, applied in data recording, recording signal processing, secure communication devices, etc., can solve the problems of unclear key correspondence and synchronization of encrypted information

Inactive Publication Date: 2004-05-19
VICTOR CO OF JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, recording the key information in this way has the problem of synchronization with the content, and the problem of unclear correspondence between the encrypted information in which area and which key is generated.

Method used

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  • Recording method, reproducing method, reproducing device and recording medium
  • Recording method, reproducing method, reproducing device and recording medium
  • Recording method, reproducing method, reproducing device and recording medium

Examples

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Embodiment Construction

[0022] An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram of an example of recording information recorded on a recording medium by the recording method of the present invention. Fig. 2 shows a block diagram of an embodiment of the playback apparatus of the present invention.

[0023] In this embodiment, the image signal and sound signal to be recorded and reproduced are compressed and encoded by MPEG2, and at the same time, the key information is alternately switched every 10 seconds to encrypt, and the encrypted Encoded data is recorded as a transport stream (TS). In FIG. 1 , the TS recording unit 1 and the key information recording unit 2 of the MPEG2 system described above are schematically shown separately for easy understanding.

[0024] There are roughly two types of key information in the above-mentioned key information in this specification, and odd-numbered key information and ...

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Abstract

A scrambling key information piece is periodically changed among a plurality of different key information pieces including first and second key information pieces. An input signal is scrambled into a scrambling-resultant signal in response to the periodically changed scrambling key information piece. The scrambling-resultant signal, the first key information piece, and the second key information piece are recorded on the recording medium. The first key information piece which is used in the scrambling of a portion of the input signal recorded during a first recording interval is recorded on the recording medium during a second recording interval being longer than the first recording interval and containing the first recording interval.

Description

technical field [0001] The present invention relates to a recording method, a playback method, a playback device, and a recording medium, and in particular to a recording method for encrypting image signals and audio signals that are recorded and reproduced on the recording medium, Playback method, playback device, and recording medium. Background technique [0002] In recent years, with the development and popularization of digital recording and reproducing equipment, it is possible to copy AV content without degrading the quality, and the development of copy prevention technology is flourishing. Among them, a technique for encrypting and recording content is generally used, and this technique is also used for DVD (Digital Versatile Disc: Digital Versatile Disc) video. Generally speaking, since encryption is encrypted with a key, it is easy to decrypt. However, when an encryption method that is difficult to decrypt is adopted, the scale of decrypted hardware will increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/14G06F3/06G06F21/10G06F21/62G11B20/00G11B20/10G11B20/12H04N5/913H04N7/16H04N9/82H04N21/433
CPCH04N21/4331H04N5/913G11B20/00086G11B20/00507G11B20/0021H04N2005/91364H04N9/8205
Inventor 日暮诚司
Owner VICTOR CO OF JAPAN LTD
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