Data distribution system and recording device and data...

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Central trusted authority provides computer authentication

Reexamination Certificate

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Details

C713S155000, C713S193000, C380S270000, C380S277000

Reexamination Certificate

active

10130302

ABSTRACT:
A license server (10) includes a CRL database (306) holding a revocation list recording therein classes predetermined corresponding respectively to a memory device, such as a memory card, and a content reproduction circuit, such as a cellular phone, that are subjected to revocation of distributing, reproducing and transferring content data. A distribution control unit (315) suspends an operation distributing content data if the distribution is addressed to a class listed on the revocation list. The revocation list is also held in the memory card and distribution control unit (315) in distributing content also transmits information for updating the revocation list in the memory card.

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Kiyoshi Yamanaka et al; NTT R&D, vol. 44, 9, pp. 813-818. 1995.

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