Method for operating conditional access system for broadcast applications

A technology for broadcast applications and conditions, applied in the field of condition selection systems for operating broadcast applications, and can solve problems such as difficulty in operation

Inactive Publication Date: 2005-01-12
IRDETO ACCESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems caused by the bandwidth limitation of EMM information make it difficult for the condition selection system using positive authorization to operate when the number of users is large.

Method used

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  • Method for operating conditional access system for broadcast applications
  • Method for operating conditional access system for broadcast applications

Examples

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Embodiment Construction

[0008] The invention will be further described below with reference to the accompanying drawing, which shows a broadcast application implementing an embodiment of the method according to the invention.

[0009] In the broadcasting application shown in Figure 1, three broadcasting devices 1-3 are coupled to a multiplexer unit 4, which includes scrambling, encoding and compression provided by said broadcasting devices 1-3 signal device. The resulting digital data stream is multiplexed into a digital transport stream, for example according to the MPEG-2 standard. The digital transport stream is modulated by a modulator 5 before transmission as shown in this embodiment. The operator of the equipment comprising the multiplexer unit 4 and the modulator 5 is responsible for transmitting the signal to public receiving equipment, such as a television set 6 shown by way of example. Transmission of said signals may be via one or more telecommunication channels including a satellite lin...

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Abstract

In a method for operating a conditional access system for broadcast applications, which conditional access system comprising a number of subscribers, each subscriber having a terminal including a conditional acces s module (11) and a secure device (12) for storing entitlements, each entitlement indicating a service for which the subscriber receiving the entitlement is entitled to watch, entitlement management messages (EMM's) ar e sent to a secure device or group of secure devices. These EMM's each provide an entitlement and a corresponding expiry date, wherein the entitlements are refreshed periodically in accordance with their expiry dates by sending EMM' s updating the expiry dates. Further, a set of extension entitlement managemen t messages (extension EMM's) is sent to all secure devices, each message indicating that all entitlements having an expiry date within a predetermine d first period are extended with a predetermined second period, wherein the EMM's updating the expiry dates are sent after the extension EMM's.

Description

Technical field: [0001] The invention relates to a method for operating a conditional access system for broadcast applications, said conditional access system comprising a plurality of users, each user having a terminal comprising a conditional access module and a A security device that stores authorizations, each authorization indicates a service (program) that the user who receives the authorization is authorized to watch the service, where entitlement management messages (EMM's) are sent to a security device or a group of security devices, each The EMM's each provide an authorization and a corresponding expiry date, wherein the authorization is periodically refreshed according to its expiry date by sending EMM's that update the expiry date. Background technique: [0002] A known method of this type is used, for example, in a pay television broadcasting system. If updates or refreshed EMM's are not received by the due date, the Security Device will not allow access to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/10H04H20/00H04NH04N7/16H04N7/167
CPCH04N21/4623H04N21/26606H04N21/63345H04N7/163H04N7/1675H04N21/4181
Inventor 安德鲁·A·瓦杰斯
Owner IRDETO ACCESS
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