Partial dual-encryption using program map tables
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United States of America Patent
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Mar 12, 2013
Grant Date -
Jun 11, 2009
app pub date -
Jan 13, 2009
filing date -
Nov 21, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and method for partial encryption are disclosed. One example method comprises: creating a program association table to include a first program number which identifies a program encrypted in accordance with a first encryption scheme, and a second program number which identifies the same program encrypted in accordance with a second encryption scheme; and creating a program map table for the same program to include first audio and video identifiers associated with the first encryption scheme and second audio and video identifiers associated with the second encryption scheme.
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