| 摘要 |
An encoded bitstream assembled by an audio or video encoder is encrypted. Th e 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 t he partly-encrypted bitstream to be of degraded quality. The selected data in t he assembled encoded bitstream is encrypted to provide the partly encrypted bitstream.
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