Data recorder restoring original data allowed to exist only uniquely
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United States of America Patent
Stats
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Apr 19, 2011
Grant Date -
May 6, 2004
app pub date -
Sep 10, 2001
filing date -
Mar 15, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A log region (1415A) and a license region (1415B) are arranged in a memory of a memory card. The license region (1415B) stores licenses such as license IDs and license keys Kc as well as validity flags corresponding to entry numbers 0-(N-1). The log region (1415A) includes a receive log (70) and a send log (80). The memory card serving as a sender of the license accepts a receive state from the memory card on a receiver side, and validates the validity flag of a region designated by the entry number in the send log (8) when the receive state is ON. Consequently, even when communication is interrupted during shifting or copying of the license, the license to be shifted or copied can be restored.
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Cited Art Landscape
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