Computer digital audio-video data recorder

• US 20040117647A1
• Filed: 12/11/2002
• Published: 06/17/2004
• Est. Priority Date: 12/11/2002
• Status: Abandoned Application

• Current Assignee: eAcceleration Corporation
• Original Assignee: Acceleration Software International Corporation
• Inventors: Ballard, Clinton L.
• Application Number:
  US10/316,448
• Publication Number:
  US 20040117647A1
• Time in Patent Office: Days
• US Class Current: 713/200
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• 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 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00507 wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 2020/10537 Audio or video recording
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/218 Write-once discs
• CPC Class Codes: G11B 2220/2512 Floppy disks
• 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 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/024 on tapes G11B27/028, G11B27/029 take precedence
• CPC Class Codes: G11B 27/032 on tapes G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 9/7921 for more than one processing mode
• CPC Class Codes: H04N 9/8042 : involving data reduction

Abstract

A digital audio video recorder captures a stream of audio video (AV) data targeted for output onto a computer display. The content is intercepted from a DVD playback, an internet data stream, an audio disc or another audio, video or audio-video source and routed to a select encoder for compression. Various encoders are available for recording at varying fidelity and speed. The intercepted also is encrypted with a key. The key is specific to the medium to which the captured AV stream is stored. The encryption step prevents the AV content from being distributed, but allows the AV stream to be played back later from the same medium onto which it was captured. The AV stream is compressed and encrypted on a frame by frame or a batch-frame basis.

Claims

1. A method for capturing audio data and video data targeted to for multimedia playback, comprising:

prior to rendering the video data for display, intercepting the video data;

compressing the video data;

prior to generating sound from the audio data, intercepting the audio data;

compressing the audio data;

multiplexing the audio data and video data

encoding the multiplexed data with a code, the code derived from one or more of the group of sources including a medium onto which the encoded multiplexed data is to be stored, a device for storing the encoded multiplexed data and a network on which the encoded multiplexed data is to be stored; and

storing the encoded multiplexed data.

2. The method of claim 1, further comprising:

retrieving a header corresponding to the intercepted audio data and video data; and

storing an altered header to change a playback device of the intercepted audio data and video data.

3. The method of claim 1 as applied for capturing audio data and video data played back from a DVD, the DVD having zones, further comprising:

prior to said storing, identifying access privilege to a DVD zone;

determining whether playback access is permitted to said identified DVD zone; and

when playback access is not permitted, precluding said storing.

4. The method of claim 1, further comprising:

intercepting the video data and the audio data on a frame by frame basis;

pausing video mixing and audio output while the intercepted video data and intercepted audio data is received for compression; and

resuming video mixing, and generating audio output, after the intercepted video data and audio data is received.

5. The method of claim 2, in which the code is an applied code, in which the encoded multiplexed data and the altered header are stored in a file, and further comprising:

retrieving the stored file;

deriving a code from said one source of said group of sources;

testing a retrieved portion of the stored file against the derived code to determine whether the encoded multiplexed data in the retrieved portion has said applied code in correspondence to the derived code;

when said applied code is not in correspondence with the derived code, precluding playback of the retrieved portion; and

when said applied code is in correspondence with the derived code, decoding and decompressing the retrieved portion to achieve audio data and video data, said achieved audio data and video data played back to generate synchronized audio output and video display.

6. A method for playing back captured audio data and video data which is stored in a file, comprising:

retrieving at least a portion of the file;

deriving a code from one source of the group of sources including;

a storage medium on which the file is stored, a storage device which accesses the stored file, and a network on which the file is stored;

testing the portion of the stored file against the derived code to determine whether the captured audio data and video data stored in said portion is encoded with an applied code which corresponds to the derived code;

when said applied code is not in correspondence with the derived code, precluding playback of the retrieved portion; and

when said applied code is in correspondence with the derived code, decoding and decompressing the retrieved portion to achieve audio data and video data, said achieved audio data and video data played back to generate synchronized audio output and video display.

7. An apparatus for capturing audio data and video data targeted to for multimedia playback, comprising:

means for intercepting the video data prior to rendering the video data for display;

means for compressing the video data;

means for intercepting the audio data prior to generating sound from the audio data;

means for compressing the audio data;

means for multiplexing the audio data and video data

means for encoding the multiplexed data with a code, the code derived from one or more of the group of sources including a medium onto which the encoded multiplexed data is to be stored, a device for storing the encoded multiplexed data and a network on which the encoded multiplexed data is to be stored; and

means for storing the encoded multiplexed data.

8. The apparatus of claim 7, further comprising:

means for retrieving a header corresponding to the intercepted audio data and video data; and

means for storing an altered header to change a playback device of the intercepted audio data and video data.

9. The apparatus of claim 7 as applied for capturing audio data and video data played back from a DVD, the DVD having zones, further comprising:

means for identifying access privilege to a DVD zone;

means for determining whether a copy restriction applies to said identified DVD zone; and

means for precluding said storing when copy restriction applies.

10. The apparatus of claim 7, further comprising:

means for intercepting the video data and the audio data on a frame by frame basis;

means for pausing video mixing and audio output while the intercepted video data and intercepted audio data is received for compression; and

means for resuming video mixing, and generating audio output, after the intercepted video data and audio data is received.

11. The apparatus of claim 8, in which the code is an applied code, in which the encoded multiplexed data and the altered header are stored in a file, and further comprising:

means for retrieving the stored file;

means for deriving a code from said one source of said group of sources;

means for testing a retrieved portion of the stored file against the derived code to determine whether the encoded multiplexed data in the retrieved portion has said applied code in correspondence to the derived code;

means for precluding playback of the retrieved portion when said applied code is not in correspondence with the derived code;

means for decoding and decompressing the retrieved portion to achieve audio data and video data when said applied code is in correspondence with the derived code; and

means for playing back said achieved audio data and video data to generate synchronized audio output and video display.

12. An apparatus for playing back captured audio data and video data which is stored in a file, comprising:

means for retrieving at least a portion of the file;

means for deriving a code from one source of the group of sources including;

a storage medium on which the file is stored, a storage device which accesses the stored file, and a network on which the file is stored;

means for testing the portion of the stored file against the derived code to determine whether the captured audio data and video data stored in said portion is encoded with an applied code which corresponds to the derived code;

means for precluding playback of the retrieved portion when said applied code is not in correspondence with the derived code; and

means for decoding and decompressing the retrieved portion to achieve audio data and video data when said applied code is in correspondence with the derived code, said achieved audio data and video data played back to generate synchronized audio output and video display.