Patent ID: 7340152

Claim:
A method of copy protection of information stored on an information carrying medium to be read from a reading device and transmitted to an application device for playback and/or recording, wherein the reading device continuously derives and reports to the application device a first characteristic of the content stored on the information carrying medium with the information transmitted from the reading device to the application device wherein the application device continuously derives and reports back to the reading device a second characteristic of the content of the information received by the application device, wherein the characteristics are verified by comparison of the first and second characteristics and wherein the result of he comparison is used to stop the transmission, playback and/or recording of information in case of a mismatch of the characteristics, characteristics in that summaries of the selected parts of the transmitted and the received information are used as characteristics and further characterized in that the information is store in a plurality of sectors in MPEG format on an optical record carrier and that the selection of sectors of information to be summarized is based on the value of a SCR based field of the sectors.