Data distribution system and recording device and data provision device used therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 15, 2007
Grant Date -
Dec 5, 2002
app pub date -
Dec 1, 2000
filing date -
Dec 3, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
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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