Parital encryption of assembled bitstreams
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United States of America Patent
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N/A
Issued Date -
Feb 26, 2004
app pub date -
Jun 6, 2003
filing date -
Dec 17, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An encoded bitstream assembled by an audio or video encoder is encrypted. The assembled encoded bitstream has a syntax. Data is selected in the assembled encoded bitstream, which data is less than all of the data in the bitstream and which, if encrypted, would result in a partly-encrypted bitstream that does not violate the syntax of the assembled encoded bitstream and would render reproduced audio or video resulting from an undecrypted decoding of the partly-encrypted bitstream to be of degraded quality. The selected data in the assembled encoded bitstream is encrypted to provide the partly encrypted bitstream.
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