Prevention of disk piracy

Apparatus for protecting data recorded on an original data storage medium against unauthorized copying, comprising an error generator, which is adapted to receive digital audio data encoded in accordance with standard 908 of the International Electrotechnical Commission and is operative to introduce an error in a subcode Q channel to be recorded on the medium with the data by manipulating one or more bits in the subcode Q channel so as to incorporate in the subcode Q channel a mode value that is inconsistent with the 908 standard.

Apparatus for protecting data recorded on an original data storage medium against unauthorized copying, comprising an error generator, which is adapted to receive audio data encoded in accordance with standard 908 of the International Electrotechnical Commission for recording in an audio track on the medium, and which is operative to set one or more bits in a subcode Q channel to be recorded on the medium with the audio data so as to identify the audio track as a digital data track.

Apparatus for protecting data recorded on an original data storage medium against unauthorized copying, comprising an error generator, which is adapted to receive data encoded for recording on the medium in accordance with an applicable recording standard, together with error detection codes corresponding to the data for use by a processor in an intended application of the medium, the error generator being operative to alter one or more data values in the encoded data prior to the recording without changing the corresponding error detection codes, such that the altered values are identified according to the standard as erroneous based on the corresponding error detection codes.

Apparatus for protecting data recorded on an original data storage medium against unauthorized copying, comprising an error generator, which is adapted to receive data encoded for recording on the medium in accordance with an applicable recording standard, and is operative to alter a portion of the encoded data prior to the recording so as to cause a reading device scanning the medium in accordance with the standard to identify the altered portion as a fault in the medium.

A data storage medium that is resistant to unauthorized copying, on which medium digital audio data encoded in accordance with standard 908 of the International Electrotechnical Commission are stored, the data including a subcode Q channel in which an error is introduced by manipulating one or more bits in the subcode Q channel so as to incorporate in the subcode Q channel a value that is inconsistent with the 908 standard.

A data storage medium that is resistant to unauthorized copying, on which medium digital audio data encoded in accordance with an applicable recording standard are stored together with error detection codes corresponding to the data for use by a processor in an intended application of the medium, one or more data values in the encoded data having been altered prior to the recording without changing the corresponding error detection codes so that the altered values are identified according to the standard as erroneous based on the corresponding error detection codes.

A data storage medium that is resistant to unauthorized copying, on which medium digital audio data encoded in accordance with an applicable recording standard, a portion of the encoded data having been altered prior to the recording so as to cause a reading device scanning the medium in accordance with the standard to identify the altered portion as a fault in the medium.