MXPA05007550A - Sistema para la desencriptacion segura de medios de flujo utilizando desencriptacion selectiva de informacion de cabecera. - Google Patents

Sistema para la desencriptacion segura de medios de flujo utilizando desencriptacion selectiva de informacion de cabecera.

Info

Publication number
MXPA05007550A
MXPA05007550A MXPA05007550A MXPA05007550A MXPA05007550A MX PA05007550 A MXPA05007550 A MX PA05007550A MX PA05007550 A MXPA05007550 A MX PA05007550A MX PA05007550 A MXPA05007550 A MX PA05007550A MX PA05007550 A MXPA05007550 A MX PA05007550A
Authority
MX
Mexico
Prior art keywords
decryption
decoder
iprm
information
reassembler
Prior art date
Application number
MXPA05007550A
Other languages
English (en)
Inventor
Diamond Joseph
Original Assignee
Gen Instrument Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gen Instrument Corp filed Critical Gen Instrument Corp
Publication of MXPA05007550A publication Critical patent/MXPA05007550A/es

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]
    • H04N21/40—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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
    • H04N21/44055—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
    • 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
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4334—Recording operations
    • 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]
    • H04N21/60—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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Un sistema proporciona seguridad mejorada en un decodificador de medios de flujo incluye la desencriptacion de informacion de medios codificada en la capa de medios, dentro de un componente de decodificador de un dispositivo 100 de reproduccion. Una fuente de contenido, tal como un flujo de medio de MPEG-4 proveniente de una red, o un archivo en un dispositivo de almacenamiento local, etc. que contiene contenido empaquetado, y suministra informacion 110 de medios encriptada y codificada. Un componente 120 de reensamblador se utiliza para iniciar la desencriptacion de una cantidad nominal de informacion necesaria para ejecutar el procesamiento adicional en el reproductor QuickTime. Las unidades de acceso encriptado se envian desde el reensamblador 120 al decodificador 140, donde el decodificador 140 ocasiona la desencriptacion de la informacion de unidad de acceso. Este planteamiento evita que informacion desencriptada, codificada, se transfiera de el reensamblador 120 al decodificador 140. Tal informacion desencriptada y codificada es especialmente susceptible a ser copiadas. En cambio, la informacion transferida del reensamblador 120 al decodificador 140 se encuentra mayoritariamente aun encriptada. En una modalidad preferida, se utiliza un sistema de administracion de derechos de Protocolo de Internet (IPRM) para ejecutar el procesamiento de desencriptacion. El reensamblador 120 hace solicitudes del proceso 150 de IPRM para abrir una sesion de desencriptacion y desencripta paquetes seleccionados para identificar el tamano de reproduccion de ventana. El decodificador 140 realiza solicitudes del proceso 150 de IPRM para desencriptar las unidades de acceso en la misma sesion de desencriptacion y para cerrar la sesion de desencriptacion. Debido a que el contenido se encripta en los limites del paquete, y cuando es llamado por el decodificador 140, el componente 150 de IPRM debe recrear los limites de paquete derivados de la unidad de acceso antes de que sea posible la desencriptacion. El componente 150 de sistema de IPRM es capaz de realizarlo debido a que los paquetes encriptados contienen una cabecera de IPRM que se utiliza por el sistema 150 de IPRM para calcular el largo del paquete. Despues de desencriptar todos los paquetes, el componente 150 de sistema de IPRM reconstruye la unidad de acceso desencriptada y regresa el contenido desencriptado al decodificador 140.
MXPA05007550A 2003-01-14 2004-01-14 Sistema para la desencriptacion segura de medios de flujo utilizando desencriptacion selectiva de informacion de cabecera. MXPA05007550A (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/342,539 US7251328B2 (en) 2003-01-14 2003-01-14 System for secure decryption of streaming media using selective decryption of header information and decryption of reassembled content
PCT/US2004/000816 WO2004066629A1 (en) 2003-01-14 2004-01-14 System for secure decryption of streaming media using selective decryption of header information

Publications (1)

Publication Number Publication Date
MXPA05007550A true MXPA05007550A (es) 2005-09-21

Family

ID=32711736

Family Applications (1)

Application Number Title Priority Date Filing Date
MXPA05007550A MXPA05007550A (es) 2003-01-14 2004-01-14 Sistema para la desencriptacion segura de medios de flujo utilizando desencriptacion selectiva de informacion de cabecera.

Country Status (6)

Country Link
US (1) US7251328B2 (es)
EP (1) EP1593265B1 (es)
CA (1) CA2511914C (es)
MX (1) MXPA05007550A (es)
TW (1) TW200428842A (es)
WO (1) WO2004066629A1 (es)

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Also Published As

Publication number Publication date
US20040139335A1 (en) 2004-07-15
EP1593265A1 (en) 2005-11-09
TW200428842A (en) 2004-12-16
US7251328B2 (en) 2007-07-31
CA2511914C (en) 2012-03-06
EP1593265B1 (en) 2014-04-16
CA2511914A1 (en) 2004-08-05
WO2004066629A1 (en) 2004-08-05

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