Title:
著作権保護システム
Document Type and Number:
Japanese Patent JP4615444
Kind Code:
B2
Abstract:
In the present invention, apparatuses are classified into a plurality of categories, and based on a media key and device key data held by apparatuses belonging to the respective categories, revocation data intended for revoking the device key held by a specific apparatus of the respective categories is generated for the respective categories, and recorded on a recording medium.
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Inventors:
Naoki Yamamoto
Hideshi Ishihara
Makoto Tatebayashi
Toshihisa Nakano
Hideshi Ishihara
Makoto Tatebayashi
Toshihisa Nakano
Application Number:
JP2005512594A
Publication Date:
January 19, 2011
Filing Date:
July 30, 2004
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H04L9/08; G06F21/10; G06F21/60; G06F21/62; G11B20/00; H04N5/00; H04N5/913; H04N7/16; H04N5/85
Domestic Patent References:
| JP2002132587A | 2002-05-10 | |||
| JP2001118329A | 2001-04-27 | |||
| JP2004200827A | 2004-07-15 | |||
| JP2000341265A | 2000-12-08 | |||
| JP2000023137A | 2000-01-21 | |||
| JPH08181689A | 1996-07-12 |
Attorney, Agent or Firm:
Hiromori Arai