Owner Irdeto Access B.V.

Inventors Ranjan, Karthik

Agent Spruson & Ferguson

Pub. Number AU-B-2003266467

Priority 02080137.9 04.12.02 EP

Filing date 4 December 2003

Wipo publication date 1 July 2004

Acceptance publication date 26 February 2009

H04N 7/08 (2006.01) Television systems - Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band

G11B 20/00 (2006.01) Signal processing not specific to the method of recording or reproducing

H04B 10/10 (2006.01) Transmission systems employing beams of corpuscular radiation, or electromagnetic waves other than radio waves, e.g. light, infra-red - Transmission through free space, e.g. through the atmosphere

H04L 9/16 (2006.01) Arrangements for secret or secure communication

H04L 12/28 (2006.01) Data switching networks - characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]

H04L 12/56 (2006.01) Data switching networks - Packet switching systems

H04L 29/06 (2006.01) Arrangements, apparatus, circuits or systems, not covered by a single one of groups - characterised by a protocol

H04L 29/08 (2006.01) Arrangements, apparatus, circuits or systems, not covered by a single one of groups - Transmission control procedure, e.g. data link level control procedure

H04N 7/081 (2006.01) Television systems - the additional information signals being transmitted by means of a subcarrier

H04N 7/16 (2006.01) Television systems - Secrecy systems

H04N 7/167 (2006.01) Television systems - Systems rendering the television signal unintelligible and subsequently intelligible