Method for encoding and decoding confidential optical disc

• US 7,533,421 B2
• Filed: 09/19/2003
• Issued: 05/12/2009
• Est. Priority Date: 09/19/2003
• Status: Active Grant

• Current Assignee: Cyberlink Corporation
• Original Assignee: Cyberlink Corporation
• Inventors: Ramsey, Don
• Primary Examiner(s): Zand; Kambiz
• Assistant Examiner(s): SHAW, YIN CHEN
• Application Number:
  US10/666,716
• Publication Number:
  US 20050066117A1
• Time in Patent Office: 2,062 Days
• Field of Search: 713/182, 713/183, 713/168, 713/173, 713/189, 713/193, 711163-164, 711/112, 726 2- 4, 726 26- 28, 726/10, 707/1, 707/205, 707/9, 369/83, 369/84, 369/53.21
• US Class Current: 726/27
• 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 20/00152 involving a password
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 2220/2575 DVD-RAMs
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: Y10S 707/99939 Privileged access

Abstract

The present invention relates to a method of encoding and decoding an optical disc, which could contain both confidential data and public viewing data. The method manipulates on the file system of the optical disc and protects the confidential data with ID field, password entry mechanism and burner/player/reader using the method of the present invention. Further, the present invention provides control over types of audience and time of viewing since ordinary optical disc player can only play public viewing data and the present invention complying player will be able to play the confidential data providing with correct password and ID field.

Claims

1. A method for encoding a confidential optical disc with a burner, the method comprising the steps of:

receiving a signal for creating the confidential optical disc to switch a burner into a burning mode;

setting a data-accessing password for future verification, wherein the data-accessing password is placed to a secret file set descriptor and allocated on any unoccupied space of an optical disc, wherein the secret file set descriptor is a non-standard file and stores a preset address pointing to a root directory record of a real directory tree;

selecting one of data sources for public viewing and confidential viewing data to be burned on the disc;

receiving a start burn signal to begin a data encoding process;

creating a temporary file system as a buffer that includes two stages;

creating a standard file set comprising a standard file system including a dummy directory tree pointing to dummy data, wherein the standard file system defines the next available address as the start of the secret file set descriptor, and

creating a parallel file set comprising the secret file set descriptor and the real directory tree pointing to real data; and

burning the buffer to the optical disc to produce the confidential optical disc.

2. The method of claim 1, wherein the burner is an optical disc writer associated with a computer or other consumer device.

3. The method of claim 1, wherein the optical disc is a CDRW.

4. The method of claim 1, wherein the optical disc is a DVDRW.

5. The method of claim 1, wherein the optical disc is a DVD RAM.

6. The method of claim 1, wherein the selected data source is a hard disc.

7. The method of claim 1, wherein the selected data source is a CD.

8. The method of claim 1, wherein the selected data source is a DVD.

9. The method of claim 1, wherein the selected data source is a DVD RAM.

10. The method of claim 1, wherein the file system is a UDF file system.

11. The method of claim 1, wherein the file system is an ISO 9660 file system.

12. The method of claim 1, wherein the creating standard file set stage further comprises the following steps:

importing a directory of dummy data from a data source;

creating descriptors that describe the whole file system;

assigning a address of a root directory to a descriptor;

reading the imported directory tree;

converting the imported directory and files into an optical disc format according to file system; and

assigning addresses to directories and file records for pointing to the dummy data.

13. The method of claim 12, wherein the standard file set is created according to a UDF file system.

14. The method of claim 12, wherein the standard file set is created according to an ISO 9660 file system.

15. The method of claim 12, wherein the data source is a hard disc folder.

16. The method of claim 12, wherein the data source is a CD.

17. The method of claim 12, wherein the data source is a DVD.

18. The method of claim 12, wherein the data source is a DVD RAM.

19. The method of claim 12, wherein the data source is a sample menu.

20. The method of claim 12, wherein the descriptor in the step of assigning a disc address of a root directory to a descriptor is a file set descriptor.

21. The method of claim 1, wherein the creating parallel file set stage further comprises the following steps:

importing a directory tree of real data from the source;

getting the next available address by reading a directory and file records of dummy data to find out where directory tree ends in order to place next descriptor and data;

assigning address to real root directory and data-accessing password to a descriptor;

reading the imported directory tree;

converting the real directory and files into optical disc format according to file system;

assigning addresses to directories and file records; and

assigning different data addresses to dummy file records and real file records.

22. The method of claim 21, wherein the selected data source is a hard disc folder.

23. The method of claim 21, wherein the selected data source is a CD.

24. The method of claim 21, wherein the selected data source is a DVD.

25. The method of claim 21, wherein the selected data source is a DVD RAM.

26. The method of claim 21, wherein the directory imported from real data in the step of importing directory tree of real data from source is placed to a descriptor.

27. The method of claim 21, wherein the directory imported from real data in step of importing directory tree of real data from source is placed to anywhere on the disc that does not have a piece of data or descriptor'"'"'s addressing fixed by file system or application layer.

28. The method of claim 1, wherein the step of burning a buffer to an optical disc further comprises the following steps:

burning descriptors;

burning dummy directory and file records;

burning real directory and file records;

burning dummy data at addresses assigned by dummy file records; and

burning real data at addresses assigned by real file records.

29. A method for reading and decoding a confidential optical disc produced by claim 1, the method comprising the steps of:

a player reading optical disc data;

receiving a view confidential data command signal;

requesting entry of a data-accessing password;

comparing the entered password with a data-accessing password placed in a secret file set descriptor allocated on any unoccupied space of an optical disc, wherein the secret file set descriptor is a non-standard file and stores a preset address pointing to a root directory record of a real directory tree;

if the entered password is correct, playing or reading real data, wherein the real data of the optical disc is pointed by the preset address; and

ending the playing/reading session.

30. The method of claim 29, wherein ending the playing/reading session comprises:

ejecting the optical disc;

turning off a view confidential data option;

turning off the player reader.

31. The method of claim 29, further comprising:

determining if the password entries entry reaches a predetermined limitation;

if the password entries entry does not reach the predetermined limitation, checking if a correct ID field exists; and

if the ID field exists in the optical disc, checking if the entered password is correct.

32. The method of claim 31, further comprising:

if the number of password entries reaches a predetermined limitation of five, ignoring any further entries until player reads optical disk data.

33. The method of claim 31, further comprising:

if the player can not find the ID field or the ID field does not exist, then ignoring the entered password until the player reads the optical disc data again.

34. The method of claim 31, further comprising:

if the entered password is incorrect, ignoring the entered password until the player reads optical disc data again.