Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2011-07-12
2011-07-12
Smithers, Matthew B (Department: 2437)
Cryptography
Video cryptography
Video electric signal modification
C380S212000, C380S287000, C725S031000
Reexamination Certificate
active
07978852
ABSTRACT:
A method of partially scrambling a data stream (6) including transport stream packets (7), each transport stream packet (7) having a header (8) and a payload (9), wherein a sequence of transport stream packets (7) has payloads carrying encoded data elements, arranged in units (15), includes: selecting transport stream packets (7) forming a subsequence of the sequence, and scrambling at least part of the payloads (9) of each transport stream packet (7) in the subsequence. The method further includes monitoring the payloads (9) of at least some of the transport stream packets (7) in the sequence for the presence of data (22) indicating a boundary between two subsequent units (15), and, for selected units (15), including at least one of the transport stream packets (7) carrying data forming part of the selected unit (15) in the sub-sequence.
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Dekker Gerard Johan
Hoogenboom Ronaldus Petrus Johannes
Palmer James Stewart Crosbie
Siedle David Neil
Stockhammer Thomas Franz
Callahan Paul
Irdeto Access B.V.
Schwegman Lundberg & Woessner, P.A.
Smithers Matthew B
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