Copy protection system for optical disc having a confusion pattern

• US 7,792,001 B2
• Filed: 04/25/2003
• Issued: 09/07/2010
• Est. Priority Date: 10/05/1998
• 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: Kamperman, Franciscus L. A. J., Staring, Antonius A. M.
• Primary Examiner(s): Dinh; Tan X
• Application Number:
  US10/423,737
• Publication Number:
  US 20030185130A1
• Time in Patent Office: 2,692 Days
• Field of Search: 3692752-2754, 369/53.21, 380201-203, 726 27- 33
• US Class Current: 369/53.21
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00615 said format change concerning the logical format of the recording medium, e.g. the structure of sectors, blocks, or frames
• CPC Class Codes: G11B 20/00884 involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm

Abstract

User information is encoded on a record carrier in accordance with a first record carrier standard, the encoding of the user information also being in accordance with a second record carrier standard. Also, format information is provided on the record carrier for presenting the user information in a predetermined manner, at least a portion of the format information being according to the second standard and not in accordance with the first standard so that a player in accordance with the first standard and not in accordance with the second standard can not play the user information in the predefined manner.

Claims

1. A method comprising the acts of:

providing user information encoded on a record carrier, the encoding being in accordance with predefined encoding rules that include reading from a first location format information required for presenting the user information; and

providing the format information at a second location different from the first location so that a player in conformance with the predefined encoding rules can not play the user information.

8. The method of claim 1, wherein the second location is within a predefined area of the information carrier and is separated by information related to the user information.

9. The method of claim 1, wherein the second location is variably selected within a predefined area of the information carrier.

10. The method of claim 1, further comprising the act of providing other format information at the first location, the other format information being different than the format information.

11. The method of claim 1, wherein the other format information comprises valid information for reading only a part of the user information, the part including a warning message or a preview of the user information.

12. The method of claim 1, further comprising the acts:

attempting to read the format information from the first location; and

when the format information is not retrievable from first location, supplying information regarding the second location for reading the format information from the second location.

13. The method of claim 1, further comprising the acts of:

providing a device for reading the user information; and

providing the device with a location of the second location for reading the format information from the second location.

14. The method of claim 1, wherein the act of providing the format information at the second location hides the format information for devices that read the record carrier based on the predefined encoding rules.

2. A method comprising the acts of:

providing user information encoded on a record carrier, the encoding being in accordance with predefined encoding rules specifying a specified location of format information that is necessary for playing the user information;

providing the format information at a further location different from the specified location; and

providing further format information at the specified location, the further format information being different than the format information so that a player in conformance with the predefined encoding rules can not play the user information when the further information is read from the specified location.

3. The method of claim 2, wherein the further format information is a confusion pattern at the specified location.

4. The method of claim 2, further comprising the act of providing the format information at a variably selected further location within a predefined area of the information carrier.

5. The method of claim 2, wherein the further format information is access information indicative of a location of the format information.

6. The method of claim 2, further comprising the

act of encrypting the format information at said further location using an encryption key.

7. A method comprising the acts of:

providing user information encoded on a record carrier, the encoding being in accordance with predefined encoding rules that include reading from a first location format information required for presenting the user information; and

providing the format information at a second location different from the first location so that a player in conformance with the predefined encoding rules can not play the user information;

wherein the format information comprises address information indicative of a user information area, and wherein other format information at the first location comprises fake address information indicative of an area different from the user information area.