Method for managing recorded streams in a rewritable recording medium

• US 7,206,892 B2
• Filed: 05/29/2003
• Issued: 04/17/2007
• Est. Priority Date: 06/05/2002
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Cho, Sung Ryun, Kim, Mi Hyun, Park, Sung Wan, Kim, Byung Jin, Seo, Kang Soo
• Primary Examiner(s): Kim; Matthew
• Assistant Examiner(s): PATEL, HETUL B
• Application Number:
  US10/446,852
• Publication Number:
  US 20030229642A1
• Time in Patent Office: 1,419 Days
• Field of Search: 711/100, 711/156, 725/29, 725/94, 725/134, 386/94
• US Class Current: 711/100
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 2221/2143 Clearing memory, e.g. to prevent the data from being stolen
• CPC Class Codes: G06F 2221/2151 Time stamp
• 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 20/00666 involving a step of erasing or nullifying data, e.g. data being overwritten with a random string
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/2541 Blu-ray discs; Blue laser DVR discs
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal

Abstract

The present invention relates to a method for managing playlists of a rewritable recording medium in order to prevent unlimited playback or illegal edition of television broadcast programs or movies wherein copyright protection is required. The present invention operates by adding information needed for automatic timed deletion of consecutively recorded clips of A/V streams and deletion time information into the playlists of a recording medium such as a high density rewritable optical disc (BD-RW), whereby referring to the recorded information, the corresponding clips of A/V streams are automatically deleted.

Claims

1. A method for managing digital data, comprising the steps of:

recording the digital data onto a recording medium, the digital data including a digital content; and

recording management information onto the recording medium to automatically delete the digital content after a predetermined time,

wherein the management information includes indication information indicating whether or not the digital content is to be deleted after the predetermined time, and

wherein the management information is recorded into a playlist referring to the digital content.

2. The method according to claim 1, wherein the management information further includes time information indicating when the digital content is to be deleted, and wherein the time information is valid only when the indication information indicates that the digital content is to be deleted.

3. The method according to claim 2, wherein the time information is one of an absolute time of deletion or a relative time of deletion counted from an initial access.

4. The method according to claim 3, wherein the initial access to the digital content is a first playback of the digital content.

5. The method according to claim 1, wherein the management information is additionally recorded into a field of user interface application information playlist of the playlist.

6. The method according to claim 1, wherein the playlist is included in a logical volume conforming to a Blu-ray disc format.

7. A method for managing digital data, comprising the steps of:

(a) checking management information associated with a timed deletion of the digital data, wherein the digital data includes a digital content recorded in a recording medium and wherein the management information includes indication information indicating whether or not the digital content is to be deleted after a predetermined time; and

(b) determining whether or not to delete the digital content after the predetermined time based on a result of checking the management information,

wherein the management information is recorded in a playlist, wherein the playlist refers to the digital content.

8. The method according to claim 7, wherein the management information includes time information indicating when to delete the digital content,

wherein the time information is valid only when the indication information indicates that the digital content is to be deleted.

9. The method according to claim 8, wherein the step (a) includes checking the time information only when the indication information indicates a presence of the time information.

10. The method according to claim 8, wherein the time information includes an absolute time and wherein the step (b) includes deleting the digital content if a present time is past the absolute time specified in the time information.

11. The method according to claim 8, wherein the time information includes a relative time amount and wherein the step (b) includes deleting the digital content if an elapsed time from an initial access of the digital content has passed the relative time amount specified in the time information.

12. The method according to claim 11, wherein the initial access to the digital content is a first playback of the digital content.

13. The method according to claim 7, wherein the playlist is included in a logical volume conforming to a Blu-ray disc format.