System for controlling the use of portable data media
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United States of America Patent
Stats
-
Apr 7, 1992
Grant Date -
N/A
app pub date -
Jun 27, 1989
filing date -
Jun 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to making use of a 'black' list in a system where goods or services are provided in response to a memory card being presented. The complete 'black' list is stored in the memory (46) of a computer center (40). The identification numbers of the cards are subdivided into a plurality of classes. The memory (28) of each local terminal (10) stores the ranks of classes having at least one identification number on the 'black' list.
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