Patent ID: 7924660

Claim:
An optical data carrier, comprising: at least one session in which one or more tracks are stored, wherein each session includes a plurality of data frames, and wherein each data frame includes controlling data and content data coded in a first format, wherein at least a part of at least one bit sequence within said content data is a bit sequence which does not correspond to constant data with respect to a second format and is chosen such that a corresponding audio signal represents a psychoacoustic model ensuring that the audio signal cannot be perceived by the human auditory system; the second format corresponds to data which is part of lead in area data according to a predetermined CD standard, lead out area data according to the predetermined CD standard, or pause data assigned to a digital audio track; and content data coded in said first format is obtained from content data coded in said second format by a transformation process which includes at least eight-to-fourteen modulation (EFM) processing according to the IEC 908 standard or the ISO/IEC 10149 standard.