Sony United Kingdom Limited

Paul Gugenheim

Jonathan James Stone

Jason Charles Pelly

Andrew Collins

Richard Daniel Foster

Isabel DeLacour

A client device for use in a system having a server, the client device including: a receiving device configured to receive information material from the server, the information material containing a reversible modification providing a visually perceptible disturbing effect having been applied to the information material by using an invertible algorithm which uses values generated from one or more keys, and to receive identifying information that distinguishes the information material from other information material available from the server and condition information which defines a predetermined condition that should be met in order for the reversible modification to be reversed.

Watermarking and transferring material

A system for watermarking and transferring watermarked material comprises a transaction server, first and second clients, first apparatus for applying a perceptible watermark to the material and second apparatus for removing the watermark. The server, clients and first and second apparatus are linked by one or more communications networks. The system is arranged to implement the steps of:

Growing community of inventors

West Hampstead, United Kingdom

Paul Gugenheim