System for protection of software in memory against unauthorized use
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United States of America Patent
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-
Jan 14, 1992
Grant Date -
N/A
app pub date -
Nov 13, 1989
filing date -
Nov 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The address space of a data storage device is arbitrarily divided into a plurality of data-segments and a different data scrambling algorithm is assigned to each of the data-segments. A programmable address scrambling device is interposed between the address port of the data storing device and a system address bus. An appropriate one of many possible scrambling keys must be supplied to the programmable address scrambling device for each of the data-segments in order to retrieve a desired dataword within each of the data-segments.
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