WO2005029756A2 - System and method for partially encrypted multimedia stream - Google Patents
System and method for partially encrypted multimedia stream Download PDFInfo
- Publication number
- WO2005029756A2 WO2005029756A2 PCT/US2004/006987 US2004006987W WO2005029756A2 WO 2005029756 A2 WO2005029756 A2 WO 2005029756A2 US 2004006987 W US2004006987 W US 2004006987W WO 2005029756 A2 WO2005029756 A2 WO 2005029756A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stream
- encrypted
- sfream
- legacy
- predetermined portions
- Prior art date
Links
Classifications
-
- 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
- H04N21/238—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
- H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
-
- 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
- H04N21/236—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
-
- 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
- H04N21/236—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
- H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
-
- 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
- H04N21/238—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
- H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
- 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
-
- 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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- 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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/43607—Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/60—Digital content management, e.g. content distribution
Definitions
- the present invention relates generally to encrypted multimedia streams.
- Multimedia streams that are sought to be protected can be encrypted at the transmitter (colloquially referred to as the "head end") with keys in a way that receiving television set-top boxes (STBs) that have complementary keys can decrypt the content for viewing.
- head end television set-top boxes
- CA head end conditional access
- the legacy CA components that are made by the incumbent providers can be programmed by the incumbent providers to detect that the above-mentioned process is ongoing. Consequently, the legacy components might be programmed by the incumbents to defeat the process and, thus, to maintain a de facto monopoly. Having recognized this possibility, the solution below is provided.
- a method for multimedia transmission includes generating a copy of a multimedia stream to render first and second clear streams having identical predetermined portions.
- the method also includes sending the first clear stream to a first conditional access (CA) component, which can be a legacy component provided by an incumbent, to encrypt the entire first clear stream to render a completely encrypted stream without the legacy component knowing about the second clear stream.
- CA conditional access
- Encrypted versions of the predetermined portions are obtained from the completely encrypted stream.
- the second clear stream is used to encrypt the predetermined portions using a second CA component to render a partially encrypted stream.
- the method then contemplates inserting the encrypted predete ⁇ nined portions obtained from the completely encrypted stream into the partially encrypted stream for transmission thereof.
- the partially encrypted stream with two encrypted versions of each critical packet is sent to plural set-top boxes over cable.
- the partially encrypted stream can be wirelessly broadcast to plural receivers. re era y, e me o inc u es e ermining oca io i e pre e erm ne por ons us ng corresponding offsets from at least one packet identifier (PID).
- PID packet identifier
- the offsets can be in integral numbers of packets from at least one PID.
- the offsets are used for identifying the locations of the encrypted predetermined portions in the completely encrypted stream for obtaining them and inserting them into the partially encrypted stream, e.g., adjacent to the predetermined portions that were generated by the second CA component.
- a system for dual partial encryption of a digital data stream includes means for copying the stream to render first and second streams, and first conditional access (CA) means for encrypting only critical portions of the first sfream to render a partially encrypted sfream.
- Legacy CA means encrypt the entire second stream to render a substantially fully encrypted stream.
- Means are provided for combining only critical portions from the fully encrypted stream with the partially encrypted stream.
- a system for use in a digital stream transmitter head end having a legacy conditional access (CA) device includes a system CA device that encrypts at least predetermined portions, and preferably only the predetermined portions, of a first version of a stream.
- a reconstitution component combines, into a sfream such as the first version of the sfream, the predetermined portions from the system CA device with the predetermined portions obtained from a full encryption of a second version of the stream generated by the legacy CA device.
- Figure 1 is an architectural block diagram; and Figure 2 is a flow chart of the present logic.
- j_ j-_iAi ⁇ _j-.jL. uj_.& ⁇ _. _ . - j _, . __ _ _.
- a system is shown, generally designated 10, that includes a source 12 of digital data streams, such as multimedia streams.
- the streams are sent to a critical packet locator and offset detector 14 which determines which packets in the stream are "critical".
- the critical packet locator and offset detector 14 also determines the offset (in integer numbers of packets from one or more packet identifiers (PID)) of each critical packet from a reference packet, e.g., the start of frame packet.
- PID packet identifiers
- the above-referenced patent application discusses critical packet selection. For clarity and completeness, critical packets may be information frames ("I-frames") in . MPEG streams, or packetized elementary sfream (PES) headers, or "action zones" of video, or other key packets that contain information which is essential to the successful recovery of picture and/or audio data.
- packets containing references to program clock references (PCR) in the picture data are never designated as "critical" packets.
- the offsets of the critical packets are stored in a critical packet offset table 16 or other data structure.
- the stream is sent from the locator 14 to a sfream copier 18 that makes a copy of the data stream. It is to be understood that the stream could be copied before critical packets and their offsets are identified.
- one version of the stream is sent to a legacy conditional access (CA) device 20.
- CA conditional access
- the legacy CA device 20 can be considered to be a device provided by an incumbent that can process the sfream by, e.g., encoding the sfream with encryption keys, in accordance with the incumbent's proprietary CA scheme.
- the legacy CA device 20 completely encrypts the stream in accordance with conventional incumbent CA principles to render a fully encrypted stream.
- a version of the stream is sent from the stream copier to a buffer, preferably a circular first in first out (FIFO) buffer 22.
- the length of the buffer 22 should be of sufficient length (potentially a fixed length) to account for the delay caused by the processing time of the . . e . buffer 22 may be established in increments of frame/picture or sequence/GOP for management purposes.
- Figure 1 shows that a secondary CA and reconstitution device 24 receives the clear stream from the FIFO buffer and the fully encrypted sfream from the legacy CA device 20.
- the secondary CA and reconstitution device 24 includes a CA component, which encrypts only the critical packets in the clear sfream received from the buffer 22, leaving the remaining portions of the stream unencrypted to render a partially encrypted stream.
- the secondary CA device 24 uses encryption keys that are different from those used by the legacy CA device 20. If desired, the pass through the secondary CA device 24 may slave to a new PCR value output by the legacy CA device 20, with the resulting corresponding value generated by the secondary CA device 24 differing by a fixed offset.
- the secondary CA and reconstitution device 24 includes a reconstitution component, which copies or strips or otherwise obtains only the now-encrypted critical packets from the frilly encrypted sfream received from the legacy CA device 20 and inserts the packets into the partially encrypted sfream in accordance with principles below.
- the partially encrypted stream, now with two encrypted versions of each critical packet can be transmitted by a transmission system 26 over, e.g., cable, or terrestrial broadcast, or satellite broadcast. It is to be understood that the functions of the secondary CA and reconstitution device 24 can be undertaken by separate components.
- a first clear version of the sfream is sent to the legacy CA device 20 at block 34.
- the legacy CA device 20 fully encrypts the stream in accordance with incumbent CA principles.
- a second clear version of the stream is buffered at block 38 and then partially encrypted at block 40 by the secondary CA device 24.
- the secondary CA device 24 encrypts only the critical packets Block 42 represents the reconstitution function
- the encrypted critical packets from the legacy CA device 20 are obtained by accessing the critical packet offset table 16, obtaining the offsets, and counting through the fully encrypted stream using the offsets from the reference PID oi PIDs.
- the encrypted packet at that location is obtained by, e.g., copying the packet from the sfream.
- the c ⁇ tical packets are then inserted into the partially encrypted stream immediately next to the corresponding preexisting critical packets in the stream that were generated by the secondary CA device 24.
- the partially encrypted stream with two encrypted versions of each critical packet, one from the legacy CA device 20 and one from the secondary CA device 24, is transmitted at block 44. While the particular SYSTEM AND METHOD FOR PARTIALLY ENCRYPTED MULTIMEDIA STREAM as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention.
- the secondary CA device 24 could completely encrypt the stream, and the critical packets from the fully encrypted versions from the legacy and secondary CA devices could be copied and inserted into a third clear version of the sfream from which the unencrypted critical packets have been removed.
- the scope of the present invention thus fully encompasses other embodiments which _ may become o vious o ose s i e m e ar , an a e scope o e presen inven ion is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more".
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020057018437A KR101054161B1 (en) | 2003-03-31 | 2004-03-08 | System and method for partially encrypted multimedia stream |
CA2517433A CA2517433C (en) | 2003-03-31 | 2004-03-08 | System and method for partially encrypted multimedia stream |
EP04785864.2A EP1609313B1 (en) | 2003-03-31 | 2004-03-08 | System and method for partially encrypted multimedia stream |
JP2006509238A JP4477628B2 (en) | 2003-03-31 | 2004-03-08 | Multimedia transmission method and apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/403,834 | 2003-03-31 | ||
US10/403,834 US7215770B2 (en) | 2002-01-02 | 2003-03-31 | System and method for partially encrypted multimedia stream |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005029756A2 true WO2005029756A2 (en) | 2005-03-31 |
WO2005029756A3 WO2005029756A3 (en) | 2005-09-22 |
Family
ID=34375137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/006987 WO2005029756A2 (en) | 2003-03-31 | 2004-03-08 | System and method for partially encrypted multimedia stream |
Country Status (7)
Country | Link |
---|---|
US (2) | US7215770B2 (en) |
EP (1) | EP1609313B1 (en) |
JP (1) | JP4477628B2 (en) |
KR (1) | KR101054161B1 (en) |
CN (2) | CN102045590B (en) |
CA (1) | CA2517433C (en) |
WO (1) | WO2005029756A2 (en) |
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Also Published As
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CA2517433A1 (en) | 2005-03-31 |
EP1609313A4 (en) | 2012-02-08 |
KR20060112197A (en) | 2006-10-31 |
EP1609313A2 (en) | 2005-12-28 |
WO2005029756A3 (en) | 2005-09-22 |
EP1609313B1 (en) | 2021-05-19 |
KR101054161B1 (en) | 2011-08-03 |
CN1768534A (en) | 2006-05-03 |
JP4477628B2 (en) | 2010-06-09 |
CN102045590B (en) | 2016-09-14 |
US20040073917A1 (en) | 2004-04-15 |
US7773750B2 (en) | 2010-08-10 |
US7215770B2 (en) | 2007-05-08 |
JP2006523424A (en) | 2006-10-12 |
CN102045590A (en) | 2011-05-04 |
US20070204146A1 (en) | 2007-08-30 |
CA2517433C (en) | 2012-01-03 |
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