Patent ID: 7954164

Claim:
A method of using a replay device for detecting a copied record carrier having a table of contents, the method comprising acts of: providing at least one encoder device for mastering a table of contents on an original record carrier to include entries in a non-standard sequence, a standard table of contents having entries in a standard sequence indicating that the corresponding at least one record carrier is a copy; storing subcode data on said original record carrier in subcode frames of a subcode channel, each subcode frame comprising synchronization symbols and data symbols at predetermined positions within said subcode frame; and assigning and storing a number of additional synchronization symbols to at least one subcode frame at positions provided for data symbols; providing at least one decoder device for generating, during read-out of said subcode channel, a check signal indicating presence or absence of said additional synchronization symbols; and preventing copying of said record carrier if said check signal indicates the absence of additional synchronization symbols in said subcode frames, wherein the record carrier is an optical storage disk.