Owner Contentguard Holdings, Inc.

Inventors Tadayon, Bijan; Wang, Xin; Lao, Guillermo; Nahidipour, Aram; Raley, Michael C.; Ta, Thanh T.

Agent Davies Collison Cave

Pub. Number AU-B-2002303732

PCT Number PCT/US02/15201

PCT Pub. Number WO2002/098042

Priority 09/867,747 31.05.01 US

Filing date 15 May 2002

Wipo publication date 9 December 2002

Acceptance publication date 10 January 2008

G06Q 50/00 (2006.01) Systems or methods specially adapted for a specific business sector, e.g. health care, utilities, tourism or legal services

G06F 21/00 (2006.01) Security arrangements for protecting computers or computer systems against unauthorised activity

G06Q 30/00 (2006.01) Commerce, e.g. marketing, shopping, billing, auctions or e-commerce

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

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

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