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Providing control words to a receiver

A technology of control words and receivers, applied in the field of computer product programs, can solve problems that do not provide scalable and efficient solutions, have never been used, etc.

Inactive Publication Date: 2011-08-10
IRDETO ACCESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method allows reducing the number of separate ECM streams sent to the receiver, however, the amount of information sent to the receiver is still comparable to conventional schemes
In addition, multiple CWs associated with this common key packet need to be stored in the receiver's security module, where most of the control words may never be used (for example, if the user continuously watches the same program)
Therefore, using such common key blocks does not provide a scalable and efficient solution for processing key blocks comprising a large number of CWs

Method used

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  • Providing control words to a receiver
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  • Providing control words to a receiver

Examples

Experimental program
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Embodiment Construction

[0035] figure 1 A schematic representation of a conventional conditional access system (CAS) 100 is shown. The system includes a head-end system 102 for generating a scrambled data stream 104 (e.g., a transport stream or a multi-program transport stream) and sending it over one or more networks 106 to one or more conditional access devices 108 ( For example, set-top boxes and / or mobile conditional access terminals).

[0036] A multiplexer (MUX) 110 in the headend multiplexes various input streams, e.g., elementary streams comprising one or more service streams 112a-112d such as television programs, and produces Transport Stream (TS) A transport stream of packets, each packet having a header and a payload, where the payload includes data units from a particular elementary stream. Depending on the content and its format (eg HDTV), an MPEG-2 multi-service transport stream associated with one transmission frequency may typically include about 10 television channels. Typically, ...

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PUM

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Abstract

The inention relates to providing control words to a receiver. A method and a system for providing control words to at least one a receiver are described wherein said receiver is associated with a secure module. The method comprises the steps of receiving at least part of a code book comprising code information for descrambling one or more service streams in a scrambled data stream sent to said receiver; providing a control word request associated with at least one crypto period in at least one of said service streams; and, in response to said control word request, generating on the basis of said code information at least one control word for descrambling data in said service stream and associated with said crypto period.

Description

technical field [0001] The present invention relates to providing control words to receivers, and in particular (but not necessarily) to methods and systems for providing control words to at least one receiver, receivers and security modules for such systems, for distributing Data structures of control words, and computer product programs using such methods. Background technique [0002] Conditional access systems for digital video broadcasting (DVB) transmissions are well known and widely used in conjunction with pay television services. Such a system provides secure transmission of a broadcast stream comprising one or more services to a digital receiver incorporated in, for example, a set-top box or a mobile terminal supporting the broadcast service. In order to prevent unauthorized viewing of the broadcast service, the data packets are scrambled (encrypted) at the transmitter using a randomly generated encryption key, which is usually called a control word. Further secu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/262H04N21/4623
CPCH04N21/4623H04N21/26606H04N7/163H04N7/1675H04N21/4181H04N21/83
Inventor E·韦斯特维尔特G·J·德克尔
Owner IRDETO ACCESS