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Information reproduction apparatus and method

A technology for information reproduction and equipment, applied in the direction of optical recording/reproduction/erasing methods, information storage, recording information storage, etc., can solve the problems of reducing product output, increasing key data volume, increasing cost requirements, etc.

Inactive Publication Date: 2007-05-09
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will inevitably increase the cost requirement, reduce the output of the product, and make it difficult to increase the storage capacity to increase the amount of key data stored in the memory

Method used

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  • Information reproduction apparatus and method
  • Information reproduction apparatus and method
  • Information reproduction apparatus and method

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Experimental program
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Embodiment Construction

[0020] Various embodiments according to the present invention will be described later with reference to the accompanying drawings. According to an embodiment of the present invention, generally in the embodiment of the present invention, key data items are stored in a key data table unit provided in addition to the decryption unit. Therefore, even if a large number of key data items are used to encrypt a large number of partial content data items, it is sufficient if the key data items are stored in the table. This will increase the degree of freedom in the design of the device.

[0021] An embodiment of the present invention will be described later with reference to the accompanying drawings. Fig. 1 shows the structure of an optical disc reproducing apparatus employing the present invention. As shown in the figure, an optical disk (DVD) 11 is rotated by a disk motor 10 . The information recorded on the optical disc 11 is read out by the optical head 12 and converted into a...

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Abstract

Many different key data items can be prepared even if the memory capacity of a key data setting unit (32) incorporated in a content decryption unit (18). Partial content data items to be successively read are stored in an accumulation medium (11), encrypted with corresponding key data items. There are provided a key data table which stores the key data items, a read processing section (303a) for reading, from the accumulation medium, the partial content data items, a decryption unit (18) for decrypting the read partial content data items, and a set-key selection section (303b) for reading, from the key data table, a key data item for decrypting a partial content data item to be decrypted, and a key data item for decrypting a partial content data item to be processed next at least, the set-key selection section also setting the read key data items in the decryption unit.

Description

technical field [0001] The present invention relates to an information reproducing apparatus and method, and more particularly, to an apparatus for reproducing encrypted content data stored in a mass storage such as a digital versatile disc (DVD) and a hard disk while decrypting the content data. Background technique [0002] When storing content data requiring copyright protection in an information recording medium, the content data is stored, encrypted. Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-122637) discloses this type of technique. In order to encrypt content data, key data (called title key, for example) is used. In order to further enhance the security of content data, the title key itself is encrypted into an encrypted title key and stored in the recording medium. In order to decrypt the encrypted title key, for example, a media ID specifying a specific device key and the disc itself is used. In this case, if an illegal disc or an illegal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G11B7/004H04L9/28G06F12/14G06F21/60G06F21/62
CPCG11B20/00086G11B20/0021G11B20/10
Inventor 吉田仁福田智之马渡正彦
Owner KK TOSHIBA