CA2544623A1 - Methods and apparatus for providing a partial dual-encrypted stream in a conditional access overlay system - Google Patents
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- CA2544623A1 CA2544623A1 CA002544623A CA2544623A CA2544623A1 CA 2544623 A1 CA2544623 A1 CA 2544623A1 CA 002544623 A CA002544623 A CA 002544623A CA 2544623 A CA2544623 A CA 2544623A CA 2544623 A1 CA2544623 A1 CA 2544623A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0478—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload applying multiple layers of encryption, e.g. nested tunnels or encrypting the content with a first key and then with at least a second key
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- H04N21/21—Server components or server architectures
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- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
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- H04N21/23895—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption
- H04N21/23897—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption by partially encrypting, e.g. encrypting only the ending portion of a movie
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- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
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- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
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- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
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- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/4508—Management of client data or end-user data
- H04N21/4524—Management of client data or end-user data involving the geographical location of the client
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- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/633—Control signals issued by server directed to the network components or client
- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
- H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
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- H04N7/17345—Control of the passage of the selected programme
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- H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
- H04L2463/101—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying security measures for digital rights management
Abstract
The present invention is directed towards providing a partial dual-encrypted stream in a conditional access overlay system. The headend equipment includes an aligner, identifier, and remapper (AIR) device (615) that receives a clear stream and one or two encrypted streams, where the two encrypted streams have been encrypted by two different encryption schemes. The AIR
device (615) identifies critical packets associated with the clear stream and subsequently allows two encrypted streams to pass and drops the critical packets of the clear stream. A multiplexer (640) then combines a percentage of the non-critical packets of the clear stream and the critical packets of the two encrypted streams to provide the partial dual-encrypted stream.
device (615) identifies critical packets associated with the clear stream and subsequently allows two encrypted streams to pass and drops the critical packets of the clear stream. A multiplexer (640) then combines a percentage of the non-critical packets of the clear stream and the critical packets of the two encrypted streams to provide the partial dual-encrypted stream.
Claims (20)
1. A method for providing an encrypted transport stream, the method comprising the steps of:
receiving a clear stream, the clear stream including a plurality of programs, each program comprising a plurality of packets each having a packet identifier (PID), wherein at least one of the plurality of packets is designated a critical packet;
scrambling the clear stream according to a first encryption method to provide a first encryption stream;
scrambling the clear stream according to a second encryption method to provide a second encryption stream;
aligning in time the clear stream, the first encryption stream, and the second encryption stream;
passing packets of the clear stream through a multiplexer, wherein when the at least one critical packet is identified in the packets of the clear stream, the critical packet of the clear stream drops and the scrambled critical packets included in the first and second encryption streams pass;
and multiplexing the packets of the clear stream and the critical packets of the first and second encryption streams to provide a partial dual encrypted stream.
receiving a clear stream, the clear stream including a plurality of programs, each program comprising a plurality of packets each having a packet identifier (PID), wherein at least one of the plurality of packets is designated a critical packet;
scrambling the clear stream according to a first encryption method to provide a first encryption stream;
scrambling the clear stream according to a second encryption method to provide a second encryption stream;
aligning in time the clear stream, the first encryption stream, and the second encryption stream;
passing packets of the clear stream through a multiplexer, wherein when the at least one critical packet is identified in the packets of the clear stream, the critical packet of the clear stream drops and the scrambled critical packets included in the first and second encryption streams pass;
and multiplexing the packets of the clear stream and the critical packets of the first and second encryption streams to provide a partial dual encrypted stream.
2. The method of claim 1, the steps further comprising remapping at least one PID value associated with the second encryption stream, whereby the scrambled packets of the first and second encryption streams each have a differing PID value.
3. The method of claim 1, wherein the aligning step comprises buffering each of the clear stream, the first encryption stream, and the second encryption stream.
4. The method of claim 3, the aligning step comprising the further steps of:
searching the clear stream for a reference packet; and comparing the reference packet with packets in the first encryption stream and the second encryption stream, wherein the packets associated with the clear stream passes and the packets associated with the first and second encryption streams drop until the packets associated with the first and second encryption stream match the reference packet.
searching the clear stream for a reference packet; and comparing the reference packet with packets in the first encryption stream and the second encryption stream, wherein the packets associated with the clear stream passes and the packets associated with the first and second encryption streams drop until the packets associated with the first and second encryption stream match the reference packet.
5. The method of claim 1, comprising the further step of demultiplexing each of the clear stream and the first and second encryption streams to provide a plurality of programs.
6. The method of claim 5, wherein a common program demultiplexed from each stream is provided to a common aligner, identifier, and remapper device.
7. A partial dual-encryption device, comprising:
a port for providing a first encrypted stream from a first scrambler;
a port for providing a second encrypted stream from a second scrambler;
an aligner, identifier, and remapper (AIR) device coupled to each scrambler for providing a partial dual-encrypted stream, wherein a clear stream having at least one critical packet is provided to each scrambler and the AIR device, wherein the AIR device aligns packets of the clear stream, the first encrypted stream, and the second encrypted stream, and wherein, upon identification of the at least one critical packet of the clear stream, provides the partial dual-encrypted stream including non-critical packets of the clear stream, a critical packet of the first encrypted stream, and a remapped critical packet of the second encrypted stream.
a port for providing a first encrypted stream from a first scrambler;
a port for providing a second encrypted stream from a second scrambler;
an aligner, identifier, and remapper (AIR) device coupled to each scrambler for providing a partial dual-encrypted stream, wherein a clear stream having at least one critical packet is provided to each scrambler and the AIR device, wherein the AIR device aligns packets of the clear stream, the first encrypted stream, and the second encrypted stream, and wherein, upon identification of the at least one critical packet of the clear stream, provides the partial dual-encrypted stream including non-critical packets of the clear stream, a critical packet of the first encrypted stream, and a remapped critical packet of the second encrypted stream.
8. The partial dual-encryption device of claim 7, the AIR device comprising:
an aligner for aligning the packets associated with the clear stream, the first encrypted stream, and the second encrypted stream;
an identifier for identifying the at least one critical packet; and a remapper for remapping a packet identifier (PID) value associated with the second encrypted stream, the aligner comprising:
buffers for buffering the clear stream, the first encrypted stream, and the second encrypted stream; and a packet comparator for comparing a head packet associated with each stream in a buffer to determine when the buffered streams are aligned and subsequently releasing the streams for further processing.
an aligner for aligning the packets associated with the clear stream, the first encrypted stream, and the second encrypted stream;
an identifier for identifying the at least one critical packet; and a remapper for remapping a packet identifier (PID) value associated with the second encrypted stream, the aligner comprising:
buffers for buffering the clear stream, the first encrypted stream, and the second encrypted stream; and a packet comparator for comparing a head packet associated with each stream in a buffer to determine when the buffered streams are aligned and subsequently releasing the streams for further processing.
9. The partial dual-encryption device of claim 8, the AIR device further comprising:
switches responsive to the identifier for allowing one of the packets associated with the clear stream and the packets associated with the first and second encrypted streams to pass through to a multiplexer.
switches responsive to the identifier for allowing one of the packets associated with the clear stream and the packets associated with the first and second encrypted streams to pass through to a multiplexer.
10. The partial dual-encryption device of claim 7, further comprising:
a first demultiplexer coupled to the first scrambler to provide a plurality of first encrypted program streams;
a second demultiplexer coupled to the second scrambler to provide a plurality of second encrypted program streams; and a third demultiplexer for providing a plurality of clear program streams, wherein the demultiplexed program streams are provided to the AIR and processed as a common program.
a first demultiplexer coupled to the first scrambler to provide a plurality of first encrypted program streams;
a second demultiplexer coupled to the second scrambler to provide a plurality of second encrypted program streams; and a third demultiplexer for providing a plurality of clear program streams, wherein the demultiplexed program streams are provided to the AIR and processed as a common program.
11. The partial dual-encryption device of claim 10, wherein the AIR device includes a plurality of program AIR devices depending upon the number of common programs.
12. The partial dual-encryption device of claim 11, further comprising a common multiplexer for multiplexing the partial dual-encrypted stream from each of the plurality of program AIR
devices.
devices.
13. The partial dual-encryption device of claim 12, wherein the common multiplexer provides feedback to each of the program AIR devices that indicates availability of bandwidth for when the number of critical packets of the first encrypted stream and the remapped critical packets of the second encrypted stream can be increased.
14. A method for transmitting an encrypted transport stream, the method comprising the steps of:
receiving a clear stream, the clear stream including a plurality of programs, each program comprising a plurality of packets each having a packet identifier (PID), wherein at least one of the plurality of packets is designated a critical packet;
scrambling with a first scrambler the clear stream according to a first encryption method to provide a first encrypted stream;
aligning in time the clear stream and the first encrypted stream;
identifying the at least one critical packet associated with the clear stream, wherein prior to identification, packets associated with the clear stream pass to a multiplexer and encrypted packets associated with the first encrypted stream drop, and wherein subsequent to identification, packets associated with the clear stream pass to a second scrambler and encrypted packets associated with the first encrypted stream pass to the multiplexer, wherein the second scrambler provides a second encrypted stream to the multiplexer; and multiplexing non-critical packets associated with the clear stream and the encrypted critical packets associated with the first and second encrypted streams to provide a partial dual-encrypted stream.
receiving a clear stream, the clear stream including a plurality of programs, each program comprising a plurality of packets each having a packet identifier (PID), wherein at least one of the plurality of packets is designated a critical packet;
scrambling with a first scrambler the clear stream according to a first encryption method to provide a first encrypted stream;
aligning in time the clear stream and the first encrypted stream;
identifying the at least one critical packet associated with the clear stream, wherein prior to identification, packets associated with the clear stream pass to a multiplexer and encrypted packets associated with the first encrypted stream drop, and wherein subsequent to identification, packets associated with the clear stream pass to a second scrambler and encrypted packets associated with the first encrypted stream pass to the multiplexer, wherein the second scrambler provides a second encrypted stream to the multiplexer; and multiplexing non-critical packets associated with the clear stream and the encrypted critical packets associated with the first and second encrypted streams to provide a partial dual-encrypted stream.
15. The method of claim 1, the steps further comprising remapping the second encrypted stream to a new PID value.
16. A partial dual-encryption device, comprising:
a port for providing a first encrypted stream from a first scrambler;
an aligner, identifier, and remapper (AIR) device coupled to the scrambler for providing a partial dual-encrypted stream, wherein a clear stream having at least one critical packet is provided to the scrambler and the AIR device, wherein the AIR device aligns packets of the clear stream and the first encrypted stream, and identifies the at least one critical packet associated with the clear stream, wherein, upon identification of the at least one critical packet, provides the at least one critical packet to a second scrambler, the second scrambler to provide a second encrypted stream, and wherein the AIR device provides the partial dual-encrypted stream including non-critical packets associated with the clear stream and dually-encrypted critical packets associated with the first and second encrypted streams.
a port for providing a first encrypted stream from a first scrambler;
an aligner, identifier, and remapper (AIR) device coupled to the scrambler for providing a partial dual-encrypted stream, wherein a clear stream having at least one critical packet is provided to the scrambler and the AIR device, wherein the AIR device aligns packets of the clear stream and the first encrypted stream, and identifies the at least one critical packet associated with the clear stream, wherein, upon identification of the at least one critical packet, provides the at least one critical packet to a second scrambler, the second scrambler to provide a second encrypted stream, and wherein the AIR device provides the partial dual-encrypted stream including non-critical packets associated with the clear stream and dually-encrypted critical packets associated with the first and second encrypted streams.
17. The partial dual-encryption device of claim 16, the AIR device comprising:
an aligner for aligning the packets associated with the clear stream and the first encrypted stream;
an identifier for identifying the a critical packet associated with the clear stream; and a first switch responsive to the identifier for providing one of the non-critical packets associated with the clear stream to a multiplexer and the critical packet associated with the clear stream to a second scrambler;
a second switch responsive to the identifier, wherein upon identification of the critical packet, the second switch for providing a first encrypted critical packet of the first encrypted stream to the multiplexer;
the second scrambler coupled to the first switch for receiving the critical packet associated with the clear stream and providing a second encrypted critical packet; and a remapper for remapping the second encrypted packet to provide a remapped encrypted critical packet.
an aligner for aligning the packets associated with the clear stream and the first encrypted stream;
an identifier for identifying the a critical packet associated with the clear stream; and a first switch responsive to the identifier for providing one of the non-critical packets associated with the clear stream to a multiplexer and the critical packet associated with the clear stream to a second scrambler;
a second switch responsive to the identifier, wherein upon identification of the critical packet, the second switch for providing a first encrypted critical packet of the first encrypted stream to the multiplexer;
the second scrambler coupled to the first switch for receiving the critical packet associated with the clear stream and providing a second encrypted critical packet; and a remapper for remapping the second encrypted packet to provide a remapped encrypted critical packet.
18. The partial dual-encryption device of claim 17, the AIR device comprising:
a first demultiplexer coupled to the first scrambler to provide a plurality of first encrypted program streams; and a second demultiplexer for providing a plurality of clear program streams, wherein the demultiplexed program streams are provided to the AIR device and processed according to a common program stream.
a first demultiplexer coupled to the first scrambler to provide a plurality of first encrypted program streams; and a second demultiplexer for providing a plurality of clear program streams, wherein the demultiplexed program streams are provided to the AIR device and processed according to a common program stream.
19. The partial dual-encryption device of claim 18, wherein the AIR device includes a plurality of program AIR devices depending upon the number of common program streams.
20. The partial dual-encryption device of claim 19, further comprising a common multiplexer for multiplexing the partial dual-encrypted stream from each of the plurality of program AIR
devices, wherein the common multiplexer provides feedback to each of the program AIR devices that indicates availability of bandwidth for when the number of critical packets of the first encrypted stream and the remapped encrypted critical packets of the second encrypted stream can be increased.
devices, wherein the common multiplexer provides feedback to each of the program AIR devices that indicates availability of bandwidth for when the number of critical packets of the first encrypted stream and the remapped encrypted critical packets of the second encrypted stream can be increased.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/602,986 | 2003-06-25 | ||
US10/602,986 US8548166B2 (en) | 1995-04-03 | 2003-06-25 | Method for partially encrypting program data |
US10/629,839 US7224798B2 (en) | 1995-04-03 | 2003-07-30 | Methods and apparatus for providing a partial dual-encrypted stream in a conditional access overlay system |
US10/629,839 | 2003-07-30 | ||
PCT/US2004/019508 WO2005004458A2 (en) | 2003-06-25 | 2004-06-18 | Methods and apparatus for providing a partial dual-encrypted stream in a conditional access overlay system |
Publications (2)
Publication Number | Publication Date |
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CA2544623A1 true CA2544623A1 (en) | 2005-01-13 |
CA2544623C CA2544623C (en) | 2010-05-04 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2544623A Expired - Fee Related CA2544623C (en) | 2003-06-25 | 2004-06-18 | Methods and apparatus for providing a partial dual-encrypted stream in a conditional access overlay system |
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2004
- 2004-06-18 MX MXPA05014208A patent/MXPA05014208A/en active IP Right Grant
- 2004-06-18 JP JP2006517390A patent/JP2007526664A/en active Pending
- 2004-06-18 CA CA2544623A patent/CA2544623C/en not_active Expired - Fee Related
- 2004-06-18 EP EP04755595.8A patent/EP1656792B1/en not_active Not-in-force
- 2004-06-18 WO PCT/US2004/019508 patent/WO2005004458A2/en active Application Filing
- 2004-06-18 KR KR1020057024790A patent/KR101096975B1/en not_active IP Right Cessation
-
2007
- 2007-04-24 US US11/739,161 patent/US7805399B2/en not_active Expired - Fee Related
Also Published As
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US7805399B2 (en) | 2010-09-28 |
EP1656792A2 (en) | 2006-05-17 |
KR101096975B1 (en) | 2011-12-20 |
JP2007526664A (en) | 2007-09-13 |
CA2544623C (en) | 2010-05-04 |
US20040139337A1 (en) | 2004-07-15 |
EP1656792A4 (en) | 2010-03-17 |
EP1656792B1 (en) | 2013-08-14 |
WO2005004458A2 (en) | 2005-01-13 |
KR20060073894A (en) | 2006-06-29 |
WO2005004458A3 (en) | 2006-05-18 |
MXPA05014208A (en) | 2006-03-13 |
US7224798B2 (en) | 2007-05-29 |
US20070286417A1 (en) | 2007-12-13 |
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