Owner OpenTV, Inc.

Inventors Lam, Waiman; Huntington, Matthew; Dereau, Vincent; Kidd, Taylor; Alao, Rachad; Delpuch, Alain; Henrard, Jose

Agent Callinan

Pub. Number AU-B-2002237989

PCT Pub. Number WO2002/063879

Priority 60/267,876 09.02.01 US; 60/265,986 02.02.01 US; 60/279,543 28.03.01 US; 09/858,436 16.05.01 US; 60/266,210 02.02.01 US; 60/269,261 15.02.01 US

Filing date 1 February 2002

Wipo publication date 19 August 2002

Acceptance publication date 29 November 2007

G06F 13/00 (2006.01) Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units

G09C 1/00 (2006.01) Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system

H04L 12/58 (2006.01) Data switching networks - Message switching systems

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 7/173 (2006.01) Television systems - with two-way working, e.g. subscriber sending a programme selection signal

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

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