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Recording/reproduction device and content protection system

A technology for protecting systems and content, applied in encoding/decoding devices, collaborative devices, preventing unauthorized use of memory, etc., and can solve problems such as inability to use high-quality content, loss, etc.

Inactive Publication Date: 2007-03-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this case, when the content is moved from the destination memory card to the original recording and reproducing device again, the original high-quality content has been lost through image conversion, so there is a possibility that the recording and reproducing device can no longer use the high-quality data. content problem

Method used

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  • Recording/reproduction device and content protection system
  • Recording/reproduction device and content protection system
  • Recording/reproduction device and content protection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0399] A content protection system 2 will be described as a second embodiment of the present invention.

[0400]

[0401] 1. The whole system

[0402] FIG. 17 is a diagram showing the configuration of the content protection system 2 and the functional configuration of the recording / playback device 20 . As shown in the figure, the content protection system 2 includes a recording / playback device 20 , a content supply device 11 , a monitor 12 , a speaker 13 , a removable medium 14 , and a portable information terminal 15 .

[0403] Like the content protection system 1, the content protection system 2 is a system in which the recording and reproducing device 20 receives content, which is a digital broadcast program broadcast from the content supply device 11 installed in the broadcasting station, records and reproduces the received content, and The content recorded in the recording / playback device 20 is moved to the removable medium 14 (Move), and the moved content is played ba...

Embodiment 3

[0476] As a third embodiment of the present invention, a content protection system 3 will be described.

[0477]

[0478] 1. The whole system

[0479]FIG. 22 is a diagram showing the configuration of the content protection system 3 and the functional configuration of the recording / playback device 30 . As shown in the figure, the content protection system 3 includes a recording / playback device 30 , a content supply device 11 , a monitor 12 , a speaker 13 , a removable medium 14 , and a portable information terminal 15 .

[0480] Like the content protection system 1, the content protection system 3 is a system in which the recording and reproducing device 30 receives content, which is a digital broadcast program broadcast from the content supply device 11 installed in the broadcasting station, records and reproduces the received content, and The content recorded in the recording / playback device 30 is moved to the removable medium 14 , and the moved content is played back by t...

Embodiment 4

[0534] Another embodiment of the present invention will be described below with reference to the drawings. Fig. 27 is a block diagram showing the overall configuration of the copyright protection system according to the present invention. The system includes a content supply device 1101 for supplying content, a recording and reproducing device 1102 for obtaining the content, recording and reproducing the content, and moving the content, and a recording and reproducing device 1103 or a removable medium 1104 for obtaining the moved content.

[0535] When the recording / playback device 1102 receives content from the content supply device 1101 and records it, the content is encrypted and recorded on, for example, a built-in HDD. And, when moving the content, after confirming (authenticating) whether the device or the removable medium as the destination of the move is a legitimate device or a legitimate removable medium, the move of the content is executed. Furthermore, the recordi...

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PUM

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Abstract

A recording / reproduction device (10) receives a content broadcast from a content supply device (11). The recording / reproduction device (10) encrypts the received content by using a device key and generates a first encrypted content. The recording / reproduction device (10) decrypts the first encrypted content generated, and generates a content. The recording / reproduction device (10) subjects the generated content to an image conversion so as to generate a converted content and encrypts the generated converted content by using a medium key so as to generate a second encrypted content. The recording / reproduction device (10) writes the second encrypted content, the medium key, and the device key into a portable medium (14). When the portable medium (14) is inserted into a mobile information terminal (15), the mobile information terminal (15) decrypts the second encrypted content by the medium key and reproduces it.

Description

technical field [0001] The present invention relates to a recording and reproducing device for recording and reproducing content, and particularly relates to a technique for improving user convenience while preventing illegal use of content. Background technique [0002] As a countermeasure against the duplication card of the digital broadcasting program, a control signal indicating "copy once" indicating that only one recording can be made is added, encrypted and broadcasted. The digital broadcast program to which the "copy once" control signal is added can be recorded by a recording / playback device corresponding to CPRM (Content Protection for Recordable Media). A recorded digital broadcast program cannot be copied to other devices, but can only be moved by the corresponding device. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2003-228522 [0004] Non-Patent Document 1: "Modern Cipher Theory", Shinichi Ikeno, Kenji Koyama, Institute of Electronics and Commun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/14G06K17/00G09C1/00
Inventor 中野稔久大森基司横田薰原田俊治井藤好克藤村一哉高桥润
Owner PANASONIC CORP