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Patent Searching and Data


Title:
DATA STORING METHOD, DATA REPRODUCING METHOD, DATA RECORDING DEVICE, DATA REPRODUCING DEVICE, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2006/077850
Kind Code:
A1
Abstract:
Provided is a key separation type contents managing method, in which a contents key and encrypted contents are made to correspond to each other by ID information and stored in different recording media, for retrieving the contents key corresponding to the encrypted contents, at a high speed. An external recording medium is stored with a plurality of contents files containing the encrypted contents encrypted by different encryption keys and contents ID corresponding to the encrypted contents, and a semiconductor recording medium is stored with a list, which contains encryption key storage place information indicating the plate, where the encryption keys are stored, and the contents ID and which stores a list sorted by the contents IDs. When the encrypted contents are to be reproduced, the encryption key storage place information corresponding to the contents ID coincident with the contents ID of the encrypted contents is retrieved from the list and is used to read out the encryption key.

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Inventors:
OCHI MAKOTO
FUJIMURA KAZUYA
INOUE SHINJI
Application Number:
PCT/JP2006/300589
Publication Date:
July 27, 2006
Filing Date:
January 18, 2006
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
OCHI MAKOTO
FUJIMURA KAZUYA
INOUE SHINJI
International Classes:
G06F21/62; G06F17/30; G06F21/10; G06F21/44; G06F21/60; H04L9/14
Foreign References:
JP2004094677A2004-03-25
JP2003271457A2003-09-26
JP2003281172A2003-10-03
JP2001175606A2001-06-29
Other References:
UOTA K. ET AL.: "Series, Keiei Joho System Vol. 8 Database", KABUSHIKI KAISHA NIKKAGIREN SHUPPANSHA, 15 June 1993 (1993-06-15), pages 127 - 128, AND 163 - 165, XP003000720
Attorney, Agent or Firm:
Ishii, Kazuo (3-6 Kitahama 2-chome, Chuo-k, Osaka-shi Osaka 41, JP)
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