Irdeto Access B.v.

Roelof Van Wijk

Thomas Stockhammer

Andrew Augustine Wajs

Gerard Johan Dekker

David Neil Siedle

Ronaldus Petrus Johannes Hoogenboom

James Stewart Crosbie Palmer

A method of partially scrambling a data stream () including transport stream packets (), each transport stream packet () having a header () and a payload (), wherein a sequence of transport stream packets () has payloads carrying encoded data elements, arranged in units (), includes: selecting transport stream packets () forming a subsequence of the sequence, and scrambling at least part of the payloads () of each transport stream packet () in the subsequence. The method further includes monitoring the payloads () of at least some of the transport stream packets () in the sequence for the presence of data () indicating a boundary between two subsequent units (), and, for selected units (), including at least one of the transport stream packets () carrying data forming part of the selected unit () in the sub-sequence.

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Hoofddorp, Netherlands

Roelof Van Wijk