Watermarking and transferring material

Abstract

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 perceptible disturbing effect to the information material, 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; a transmission device which, in response to a user input providing enabling data which satisfies the predetermined condition, configured to transmit the identifying information and the enabling data to the server, wherein in response to the transmission of the enabling data and the identifying information, the receiving device is configured to receive a key and removing data defining an algorithm for removing the perceptible effect, the removing data being useable by a reversing device to reverse the perceptible effect; and a storage device configured to store the information material that has had the perceptible effect reversed.

Dependencies are inferred from the claim text.