Decoding system for processing encrypted broadcast, cable or satellite video data

• US 5,878,135 A
• Filed: 11/27/1996
• Issued: 03/02/1999
• Est. Priority Date: 11/27/1996
• Status: Expired due to Term

• Current Assignee: UQE LLC
• Original Assignee: Thomson Consumer Electronics Incorporated (Vantiva SA)
• Inventors: Blatter, Harold, Horlander, Thomas Edward, Bridgewater, Kevin Elliott, Deiss, Michael Scott
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/762,483
• Time in Patent Office: 825 Days
• Field of Search: 380/3, 380/4, 380/5, 380/9, 380/10, 380/20, 380/21, 380/49, 380/50, 380/59, 380/15, 380/29
• US Class Current: 380/239
• 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 21/4181 for conditional access
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/4623 Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14

Abstract

A decoder excludes an encryption code or key from decrypted or non-decrypted program output data. Decrypted program representative data is generated from an input datastream containing encrypted program data and an associated encryption code. The encrypted program data is decrypted using the encryption to provide decrypted program data. An output datastream is formed containing the decrypted program data but excluding the encryption code. The encryption code may be excluded by submitting non-encryption code data for the encryption code. The output datastream may also contain ancillary date formed to support decoding of the decrypted program data.

Claims

1. In a video decoder for receiving and processing digital video data for output and subsequent remote or local storage, a method for processing program representative data from an input datastream containing a broadcast encrypted encryption key and associated broadcast encrypted program data, comprising the steps of:

decrypting said broadcast encrypted encryption key received in said input datastream using a first algorithm to provide a broadcast encryption key for use in decrypting said broadcast encrypted program data;

re-encrypting said broadcast encryption key using a second algorithm to provide an encrypted playback key for use in decrypting encrypted program data recovered from a storage medium; and

formatting said encrypted playback key together with said associated broadcast encrypted program data to form output data suitable for storage on a storage medium by

excluding said broadcast encrypted encryption key from said output data and

incorporating said encrypted playback key in said output data.

2. A method according to claim 1, wherein said formatting step includes the step of

substituting null data for said broadcast encrypted encryption key.

3. A method according to claim 1, wherein said formatting step includes the step of

excluding said broadcast encryption key from said output data.

4. A method according to claim 1, wherein said formatting step includes the step of

incorporating data structure parameters in said output data to be compatible with the data structure resulting from excluding said broadcast encrypted encryption key and incorporating said encrypted playback key.

5. A method according to claim 1, wherein said incorporating step comprises replacing said broadcast encrypted encryption key with said encrypted playback key.

6. In a video decoder for receiving and processing digital video data for output and subsequent remote or local storage, method for adaptively processing program representative data from an input datastream containing a broadcast encrypted encryption key and associated broadcast encrypted program data, comprising the steps of:

receiving user generated data for selecting one of (a) a decrypted program output mode and (b) an encrypted program output mode;

decrypting said broadcast encrypted encryption key received in said input datastream using a first algorithm to provide a broadcast encryption key for use in decrypting said broadcast encrypted program data;

in a decrypted program output mode,

decrypting said broadcast encrypted program data using said broadcast encryption key to provide decrypted program data for output;

in an encrypted program output mode,

re-encrypting said broadcast encryption key using a second algorithm to provide an encrypted playback key for use in decrypting encrypted program data recovered from a storage medium; and

formatting said encrypted playback key together with said associated broadcast encrypted program data to form encrypted program data for output; and

excluding said broadcast encrypted encryption key from said decrypted program data and said encrypted program data for output.

7. A method according to claim 6, wherein said excluding step includes the step of

substituting null data for said broadcast encrypted encryption key.

8. A method according to claim 7, wherein said null data is substituted for said broadcast encrypted encryption key within a data field selected from one of the following data fields:

an MPEG Adaptation field;

an MPEG Packetized Elementary Stream (PES) field;

an MPEG Digital Storage Media Control Command (DSMCC) field;

Digital Satellite System (DSS™

) auxiliary packet data field; and

a non-MPEG data field.

9. A method according to claim 6, including the step of

adaptively incorporating data structure parameters in output data in said decrypted program output mode and different data structure parameters in output data in said encrypted program output mode, in response to said user generated data.

10. A method according to claim 6, wherein said formatting step includes the step of

replacing said broadcast encrypted encryption key with said encrypted playback key.

11. A method according to claim 6, wherein

said user generated data also selects a) the storage device type, and b) a particular program to be stored.

12. In a video decoder for receiving and processing digital video data for output, a method for adaptively processing program representative data from an input datastream containing a broadcast encrypted encryption key and associated broadcast encrypted program data in a first mode and an encrypted playback encryption key and associated encrypted program data recovered from a storage medium in a second mode, comprising the steps of:

receiving user generated data for selecting one of (a) said first mode, and (b) said second mode;

in response to said user generated data, selecting between

a) a first algorithm for processing said broadcast encrypted encryption key to provide a broadcast encryption key for use in decrypting said broadcast encrypted program data, and

b) a second algorithm for processing said encrypted playback encryption key to obtain said playback encryption key for use in decrypting said encrypted program data recovered from a storage medium;

in said first mode,

decrypting said broadcast encrypted program data using said broadcast encryption key to provide decrypted program data for output; and

excluding said broadcast encrypted encryption key from said decrypted program data in said data for output;

in said second mode.

decrypting said encrypted program data recovered from a storage medium using said playback encryption key to provide decrypted program data for output; and

providing said output data produced in one of said first and second modes to a device for display.

13. A method according to claim 12, wherein said selecting step comprises selecting between said first and second algorithms contained in an electronic device insertable into said video decoder.

14. A method according to claim 12, including the step of

adaptively incorporating data structure parameters in said output data produced in one of said first an second modes.