Patent ID: 7574117

Claim:
A method for use in reproducing an audiovisual product, wherein the audiovisual product has plurality of cells of audiovisual data whose playback is controlled by a plurality of sequence instructions, and wherein each of the sequence instructions has a predetermined structure location within the audiovisual product, the method comprising the steps of: receiving an access code; calculating a destination structure location within the audiovisual product by applying a destination function to the access code, said destination function being embedded in the audiovisual data; and jumping to the calculated destination structure location to thereby select a said sequence instruction corresponding to that location; wherein the destination function is structured and arranged such that, in the case that the received access code is a correct access code, the calculated destination structure location corresponds to a correct sequence instruction corresponding to a correct playback sequence, and in the case that the access code is not a correct access code, the calculated destination structure location corresponds to a different structure location which does not correspond to a correct sequence instruction.