Partial encryption and PID mapping

• US 20060115083A1
• Filed: 11/18/2005
• Published: 06/01/2006
• Est. Priority Date: 06/06/2001
• Status: Active Grant

• Current Assignee: Brant L. Candelore, Leo M. Pedlow Jr, Robert Allan Unger
• Original Assignee: Brant L. Candelore, Leo M. Pedlow Jr, Robert Allan Unger
• Inventors: Candelore, Brant L., Unger, Robert Allan, Pedlow, Leo M. Jr.
• Granted Patent: US 7,319,753 B2
• Time in Patent Office: Days
• US Class Current: 380/216
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2365 Multiplexing of several video streams
• CPC Class Codes: H04N 21/23897 by partially encrypting, e.g. encrypting only the ending portion of a movie
• CPC Class Codes: H04N 21/25875 involving end-user authentication restricting access to computer systems by authenticating users using a predetermined code G06F21/33; arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06
• CPC Class Codes: H04N 21/26606 for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/4181 for conditional access
• CPC Class Codes: H04N 21/42615 involving specific demultiplexing arrangements
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43607 Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
• CPC Class Codes: H04N 21/43853 involving multiplex stream decryption arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/43856 by partial decryption, e.g. decrypting a multiplex stream that has been partially encrypted
• CPC Class Codes: H04N 21/44055 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
• CPC Class Codes: H04N 21/4516 involving client characteristics, e.g. Set-Top-Box type, software version or amount of memory available
• CPC Class Codes: H04N 21/454 Content or additional data filtering, e.g. blocking advertisements
• 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
• CPC Class Codes: H04N 21/835 : Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 7/162 : Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
• CPC Class Codes: H04N 7/167 : Systems rendering the television signal unintelligible and subsequently intelligible
• 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 of selecting data for multiple carriage partial encryption consistent with certain embodiments involves examining unencrypted packets of data in a digital audio/video data stream to identify a packet type; and selecting packets of the identified packet type for multiple partial encryption, wherein the amount of data to be encrypted is sufficient to render a portion of an entire frame unviewable. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

Claims

1. A method of selecting data for multiple carriage partial encryption, comprising:

examining unencrypted packets of data in a digital audio/video data stream to identify a packet type; and

selecting packets of the identified packet type for multiple partial encryption, wherein the amount of data to be encrypted is sufficient to render a portion of an entire frame unviewable.

2. The method according to claim 1, wherein the packet type comprises all video packets of the frame.

3. The method according to claim 1, wherein the packet type comprises system information.

4. The method according to claim 1, wherein the packet type comprises program specific information.

5. The method according to claim 1, wherein the packet type comprises all packets representing a duration of time.

6. The method according to claim 1, wherein the packet type comprises a number of packets (N) after a start of encryption event (M).

7. The method according to claim 6, wherein the start of encryption event (M) repeats and the number of packets (N) are selected for encryption after each start of encryption event (M).

8. The method according to claim 7, wherein the start of encryption event (M) and the number of packets (N) are pseudo-random numbers.

9. The method according to claim 7, wherein the start of encryption event (M) and the number of packets (N) are one of random, pseudo-random, and semi-random numbers.

10. The method according to claim 1, wherein the packet type comprises intra-coded frames (I frames).

11. The method according to claim 1, wherein the packet type comprises predictive-coded (P frames).

12. The method according to claim 1, wherein the packet type comprises Bi-directional-coded (B frames).

13. The method according to claim 1, wherein the packet type comprises DC frames.

14. The method according to claim 1, wherein the packet type comprises start of frame transport stream packets containing PES (packetized elementary stream) headers.

15. The method according to claim 1, wherein the packet type comprises a group of pictures header.

16. The method according to claim 1, wherein the packet type comprises a video sequence header.

17. The method according to claim 1, wherein the packet type further comprises certain audio packets sufficient to diminish a measure of audio quality.

18. The method according to claim 17, wherein the certain audio packets comprise all audio packets.

19. A computer readable medium storing instructions which, when executed on a programmed processor carry out a process according to claim 1.

22. A computer readable medium storing instructions which, when executed on a programmed processor carry out a process according to claim 1.

20. A method of selecting data for multiple carriage partial encryption, comprising:

examining unencrypted packets of data in a digital audio/video data stream to identify a packet type;

selecting packets of the identified packet type for multiple partial encryption, wherein the amount of data to be encrypted is sufficient to render a portion of an entire frame unviewable;

generating a multiple partially encrypted data stream by;

encrypting the selected packets under a first encryption algorithm to produce first encrypted packets;

encrypting a duplicate of the selected packets under a second encryption algorithm to produce second encrypted packets; and

multiplexing the encrypted selected packets with packets that are not selected to produce the multiple partially encrypted data stream.

21. The method according to claim 20, wherein the packet type comprises a packet type selected from the group consisting of:

all video packets of the frame;

system information;

program specific information;

all packets representing a duration of time;

a number of packets (N) after a start of encryption event (M), wherein the start of encryption event (M) repeats and the number of packets (N) are selected for encryption after each start of encryption event (M);

intra-coded frames (I frames);

predictive-coded (P frames);

Bi-directional-coded (B frames);

DC frames;

start of frame transport stream packets containing PES (packetized elementary stream) headers;

a group of pictures header;

a video sequence header;

certain audio packets sufficient to diminish a measure of audio quality; and

all audio packets.

23. An apparatus for selecting data for multiple carriage partial encryption, comprising:

a filter that examines unencrypted packets of data in a digital audio/video data stream to identify a packet type;

a packet selector that selects packets of the identified packet type for multiple partial encryption, wherein the amount of data to be encrypted is sufficient to render a portion of an entire frame unviewable;

a first encrypter that encrypts the selected packets under a first encryption algorithm to produce first encrypted packets;

a second encrypter that encrypts a duplicate of the selected packets under a second encryption algorithm to produce second encrypted packets; and

a multiplexer that multiplexes the encrypted selected packets with packets that are not selected to produce the multiple partially encrypted data stream.

24. The apparatus according to claim 23, wherein the packet type comprises a packet type selected from the group consisting of:

all video packets of the frame;

system information;

program specific information;

all packets representing a duration of time;

a number of packets (N) after a start of encryption event (M), wherein the start of encryption event (M) repeats and the number of packets (N) are selected for encryption after each start of encryption event (M);

intra-coded frames (I frames);

predictive-coded (P frames);

Bi-directional-coded (B frames);

DC frames;

start of frame transport stream packets containing PES (packetized elementary stream) headers;

a group of pictures header;

a video sequence header;

certain audio packets sufficient to diminish a measure of audio quality; and

all audio packets.