Patent ID: 8375461
Filing Date: 2013-02-12
Classification: G11B

Abstract:
1. A method for copy-protecting data to be recorded onto an optical disc, the data to be recorded comprising content data and control data, the control data enabling an optical disc player to navigate a path through the content data, the method comprising: choosing a parameter associated with an item of content data not on the path wherein the parameter is not checked by a physical testing device which detects inner or outer parity codes and is an error detection code (EDC) for said item of content data; modifying the parameter such that the parameter is inconsistent with the item of data and wherein the modified parameter provides subversive data that does not affect a legitimate optical disc player and wherein the modified parameter is appended to user data of said item of content data; and recording the data with the modified parameter onto the optical disc without modifying an error correction code (ECC) associated with said item of content data thereby causing an optical disc copying device, which encounters the data with the inconsistent parameter, thereby reading the item of data, to report an error wherein copying of the copy-protected data by the optical disc copying device is inhibited.