Method and apparatus for background caching of encrypted programming data for later playback

• US 6,961,430 B1
• Filed: 10/30/2000
• Issued: 11/01/2005
• Est. Priority Date: 11/10/1999
• Status: Expired due to Fees

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: The DIRECTV Group, Inc. (AT&T, Inc.)
• Inventors: Gaske, T. Paul, Kepley, Walter R., Joseph, Kuriacose, Casavant, Scott
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): ARANI, TAGHI T
• Application Number:
  US09/699,650
• Time in Patent Office: 1,828 Days
• Field of Search: 380/216, 380/201, 725/46
• US Class Current: 380/216
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/4147 PVR [Personal Video Recorder] H04N5/76 takes precedence ; arrangements for broadcast with accumulation-type receivers H04H20/40
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/47211 for requesting pay-per-view content payment schemes payment architectures or payment protocols G06Q20/00, G07F
• CPC Class Codes: H04N 5/76 Television signal recording
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

A method and apparatus for enabling background caching of encrypted programming data on a storage medium for later playback in a digital video recorder (DVR) system. A set-top box (STB) equipped with a DVR searches a program guide for upcoming pay-per-view (PPV) events. When the PPV event begins, the STB tunes an appropriate transponder and begins receiving programming data packets containing audio, video, system time and conditional access data packets associated with the event, which are stored for playback on a storage medium. When the user turns the STB on and selects an option to playback a previously-recorded PPV event, the appropriate programming data is retrieved from the storage medium, and the STB recreates the original transmission timing of the data, to be displayed on a display device of the user.

Claims

1. An apparatus for performing background caching of encrypted programming for later playback, comprising:

a memory operatively connected to a bus for storing received, encrypted digital data packets of at least one pay-per-view (PPV) event;

a processor for decrypting the data packets when they are transferred by the memory via the bus; and

a decoder for decoding the decrypted data packets for display on a display device,

wherein the apparatus is adapted to search a program guide to find upcoming PPV events, and, to select at least one PPV event for recording without instruction from a user, and when the PPV event begins, the apparatus tunes to an appropriate transponder to begin receiving the encrypted digital data packets and caches the data packets of the selected at least one PPV event when in a power-down mode, and plays back a recorded PPV event in a power-up mode upon selection by the user.

2. The apparatus according to claim 1, further comprising a recording device for digitally recording the encrypted digital data packets, and for transmitting the digitally recorded data packets to the memory.

3. The apparatus according to claim 2, wherein the recording device includes at least one mass storage device.

4. The apparatus according to claim 3, wherein the mass storage device is at least one of a hard disc drive, magnetic storage device or optical storage medium.

5. The apparatus according to claim 2, wherein the processor is a transport processor operatively connected to the bus and to an input port for receiving the encrypted digital data packets from the input port.

6. The apparatus according to claim 5, further comprising:

a host processor operatively connected to the bus and the memory for performing graphics-user interface and browser functions; and

an interface for receiving the encrypted digital data packets from the transport processor, and for transferring the received encrypted digital data packets simultaneously to the memory via the bus, and to the decoder,

the memory further including a buffer space for temporarily storing the encrypted digital data packets received from the interface,

the host processor directing the memory to transfer the encrypted digital data packets to be digitally recorded by the recording device, and

the interface adapted to receive the digitally recorded data packets from the recording device via the memory and the bus.

7. The apparatus according to claim 6, the interface being further adapted to transfer the digitally recorded data packets to the decoder.

8. The apparatus according to claim 6, wherein the host processor searches a the program guide to find the upcoming PPV events.

9. The apparatus according to claim 8, wherein the digital data packets include packetized audiovisual data, system time data and conditional access data.

10. The apparatus according to claim 5, wherein the transport processor provides an additional layer of conditional access for the encrypted digital data packets.

11. The apparatus according to claim 1, wherein the data packets are time-stamped upon reception.

12. The apparatus according to claim 5,

wherein the data packets are time-stamped upon reception, and

wherein the decoder and transport processor utilize the recorded time stamps to recreate the original transmission timing of the encrypted digital data packets, only when the user selects a recorded PPV event for playback.

13. The apparatus according to claim 1,

wherein the memory stores encrypted digital data of a plurality of PPV events in repetition while the apparatus is in the power-down mode, and

wherein the user only pays for those recorded PPV events that are selected for playback in the power-up mode.

14. The apparatus according to claim 2, wherein the recording device is an external storage medium.

15. The apparatus according to claim 5, wherein the transport processor decrypts the encrypted digital data packets of the user-selected PPV event, and sends the decrypted data packets to the decoder via the interface.

16. The apparatus according to claim 15, wherein the decoder includes an MPEG A/V decoder for decoding the video portion of the decrypted digital data packets, and an AC-3/MPEG audio decoder for decoding the audio portion of the decrypted digital data packets.

17. The apparatus of claim 16, further comprising a video encoder that converts the received video portion of the decrypted digital data packets to analog for display.

18. The apparatus of claim 1, wherein the apparatus is configured as a set-top box (STB) equipped with a digital video recorder.

19. A method for background caching encrypted programming for later playback in a digital video recording (DVR) system, comprising:

storing received, encrypted digital data packets of at least one pay-per-view (PPV) event in a memory;

time-stamping the received data packets upon reception;

decrypting the data packets when they are transferred by the memory via a bus;

decoding the decrypted data packets for display on a display device;

searching a program guide to find upcoming PPV events;

selecting at least one PPV event for recording without user instruction;

tuning the DVR system to an appropriate transponder when the selected PPV event begins, to begin receiving the encrypted digital data packets; and

caching its corresponding data packets, when the DVR system is in a power-down mode; and

wherein a selected PPV event is played back when the DVR system is in a power-up mode, upon selection by the user.

20. The method according to claim 19, wherein the step of storing is repeated for a plurality of PPV events when the DVR system is in the power-down mode.

21. The method according to claim 20, wherein the user only pays for those cached PPV events that are selected for playback in the power-up mode.

22. The method according to claim 19, wherein the searching is performed by a host processor in the DVR system.

23. The method according to claim 19, further comprising decrypting the encrypted digital data packets of the user-selected PPV event, wherein the decryption is performed in a transport processor operatively connected to the memory via the bus.

24. The method according to claim 19, wherein the step of decoding includes utilizing the recorded time stamps to recreate the original transmission timing of the encrypted digital data packets, only when the user selects a recorded PPV event for playback.

25. A set-top box (STB) for performing background caching of encrypted programming for later playback, comprising:

searching means for searching a program guide to find upcoming pay-per-view (PPV) events received as encrypted data packets;

storing means for caching the received encrypted data packets for later playback; and

retrieval means for retrieving the data packets for display,

wherein the searching means searches a program guide for the at least one PPV event without user instruction and the storing means caches the data packets of the at least one PPV event received from the appropriately tuned transponder when the STB is in a power-down mode, and plays back a recorded PPV event when the STB is in a power-up mode.

26. The STB of claim 25, wherein the searching means and the storing means repeat searching and recording for a plurality of PPV events, the recorded plurality of PPV events being stored on an external storage medium for later playback.

27. The STB of claim 25,

wherein the encrypted digital data packets are time-stamped upon reception, and

wherein the retrieval means decrypts the encrypted digital data packets, uses the recorded time stamps to recreate the original transmission timing data of the data packets, and decodes the decrypted digital data packets for display on a display device.

28. The STB of claim 25, wherein a user only pays for those cached PPV events that are selected for playback in the power-up mode.