Method and system of copy protection of information

• US 7,340,152 B1
• Filed: 04/13/2000
• Issued: 03/04/2008
• Est. Priority Date: 04/14/1999
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Hall, Trevor G. R., Linnartz, Johan P. M. G., Talstra, Johan C.
• Primary Examiner(s): Boccio; Vincent F.
• Application Number:
  US09/548,727
• Time in Patent Office: 2,882 Days
• Field of Search: 386/94, 386/95, 386/46, 386/1, 386125-126, 360/60, 380/201, 380/203, 380/54
• US Class Current: 386/252
• CPC Class Codes: H04N 2005/91335 the copy protection signal being a watermark
• CPC Class Codes: H04N 2005/91342 the copy protection signal being an authentication signal
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection

Abstract

The invention relates to a method of copy-protection of information stored on an information carrying medium. The method allows a reading device (e.g. a DVD drive) and an application device (e.g. an MPEG decoder) to exchange copy-protection information regarding the information carrying medium (e.g. an optical record carrier like a CD or DVD) and the content on that medium. The method is cryptographically secure, taking into account the situation where reading device and application device are connected to an open bus in a personal computer. In view of the high-volume nature of the drive, the method can be implemented cheaply. The inventive method is robust against a so-called man-in-the-middle attack.

The invention relates also to a method of exchanging copy-protection information, to a copy-protection system and to devices for carrying out these methods, in particular a reading device, an application device and a device for playback and/or recording of information.

Claims

1. 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.