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Method and system for data recording/reproducing, apparatus for recording/reproducing, and media for recording program

A technology for data recording and recording media, which is applied in digital recording/reproduction, data recording, recording signal processing, etc., and can solve the problems of broadcasting stations not being able to play, AV data value reduction, and data not being reproduced.

Inactive Publication Date: 2000-08-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if particularly valuable AV data (such as a movie just released in a theater) is recorded on a recording medium with a recording / reproducing apparatus that does not limit the above-mentioned reproduction period and reproduction times, the value of the AV data will be reduced by half
In other words, broadcasting stations cannot broadcast such particularly valuable AV data without worry
[0010] A solution to the above-mentioned problem has been proposed, that is, the identifier (ID) of the STB and / or VTR equipment used to record the AV data is also recorded on the recording medium on which the AV data has been recorded, so that if someone wants to use a different equipment with the ID to reproduce the data, then the data cannot be reproduced
However, if a device without an ID recognition function is used, there will be a problem that reproduction can be performed regardless of whether the ID matches or not
In addition, assuming that all devices have an ID recognition function, and such a device cannot be used due to irreparable failure or damage, it is impossible to reproduce AV data recorded on a recording medium due to the use of an ID inherent to the device

Method used

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  • Method and system for data recording/reproducing, apparatus for recording/reproducing, and media for recording program
  • Method and system for data recording/reproducing, apparatus for recording/reproducing, and media for recording program
  • Method and system for data recording/reproducing, apparatus for recording/reproducing, and media for recording program

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0048] Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.

[0049]FIG. 1 is a structural diagram showing the structure of a data recording / reproducing system according to a first embodiment of the present invention. The data recording / reproducing system according to the present invention includes a set-top box (STB, or satellite broadcast receiver) 1, an IC card for providing information (such as user ID) to the STB 1, an antenna 3 and a display 4 connected to the STB 1, A VTR device 5 corresponding to the VTR device of the present invention, and a recording medium 6 on which data is recorded / reproduced by the VTR device 5.

[0050] STB1 contains a card reader 10 for reading the information recorded on the IC card 2 and recording necessary information on the IC card 2; STB information storage device 17 for storing information such as the device ID of STB1; video decoding The audio decoder 11 and the audio decoder 12 are use...

no. 4 example

[0100] Hereinafter, a fourth embodiment according to the present invention will be described with reference to the drawings. This embodiment is different from the above-mentioned first embodiment in that the public key / secret key used to encrypt / decrypt the content key is an inherent key in the service recorded on the IC card of the present invention. For this reason, the same components as in the first embodiment are denoted by the same reference numerals, and their description is omitted. In addition, components not specifically described are the same as those in the first embodiment.

[0101] The structure of the data recording / reproducing system according to the present embodiment is the same as the structure of the data recording / reproducing system in the first embodiment.

[0102] The operation of this embodiment is described below.

[0103] FIG. 8 is a flowchart showing the flow of data when the data recording / reproducing system according to the fourth embodiment of the pre...

no. 5 example

[0107] Hereinafter, a fifth embodiment according to the present invention will be described with reference to the drawings. This embodiment is different from the above-mentioned first embodiment in that the key encryption device of the present invention is provided for VTR equipment, and correspondingly, the tuning device of the present invention has a second key encryption device, which uses a public key. The content key is encrypted, and the VTR device of the present invention has a second decryption device that decrypts the encrypted content key using the public key. For this reason, the same components as in the first embodiment are denoted by the same reference numerals, and their description is omitted. In addition, components not specifically described are the same as those in the first embodiment.

[0108] Fig. 10 is a structural diagram showing the structure of a data recording / reproducing system according to a fifth embodiment of the present invention. The structure of t...

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Abstract

A data recording / reproducing method wherein encrypted digital data obtained by subjecting digital data to first encrypting by using a contents key and encrypted contents key obtained by subjecting the contents key to second encrypting are recorded on a recording medium, the encrypted digital data and the encrypted contents key, having been recorded, are reproduced, and the encrypted digital data is decrypted by using the contents key obtained by decrypting the encrypted contents key, thereby to obtain the digital data.

Description

Technical field [0001] The present invention relates to a data recording device for recording digital data, a data reproducing device for reproducing digital data, a data recording / reproducing system, and a data recording / reproducing method, in which the reproduction period and the digital data are restricted according to copyright and similar rights Number of reproductions. Background technique [0002] Currently, copyrighted AV data (such as movies and music, etc.) are stored in video tapes. The user only needs to spend money to rent a video tape from a video tape rental store for a predetermined period of time (for example, one week), and then replay the video tape to enjoy movies and music. [0003] On the other hand, unlike the above video tape rental system, due to the development of digital technology and encryption technology, such a device can be designed that can receive movies, music and other programs from broadcasting stations through communication satellites, and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00H04N5/775H04N5/913
CPCG11B20/00086H04N2005/91364H04N5/913G11B20/0021G11B20/0071H04N5/775G11B20/00166G11B20/00224G11B20/00181
Inventor 山田正纯饭塚裕之后藤昌一武知秀明
Owner PANASONIC CORP