System and method for enabling CAS (Conditional Access System) terminal to timely obtain entitlement

Abstract

The invention discloses a system for enabling a CAS (Conditional Access System) terminal to timely obtain an entitlement, which comprises a scrambling machine, a CA (Certification Authority) server, an EMM (Entitlement Management Message) management server and a CAS terminal, wherein the scrambling machine is used for carrying out two-way communication with the CA server, sending a control word to the CA server and receiving entitlement control information and entitlement management information sent by the CA sever; the CA server is used for carrying out two-way communication with the EMM management server and sending the entitlement management information to the EMM management server; the EMM management server is used for carrying out two-way communication with the CAS terminal, receiving a request of the CAS terminal and sending the entitlement management information to the CAS terminal; and the CAS terminal is used for carrying out one-way communication with the scrambling machine through a broadcasting network, receiving the entitlement control information, the entitlement management information and scrambling data sent by the scrambling machine, and descrambling and broadcasting programs. According to the system, the entitlement information can be obtained by the CAS terminal at any time when the terminal is started, so the rights and interests and excellent experience of users to enjoy a digital television service are guaranteed; artificial entitlement intervention is not needed, the workload of an operator and users is lightened; and the system is convenient to use.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to a system and method for realizing the timely authorization of a CAS terminal. Background technique [0002] Conditional access system (CAS) is the basic means to ensure the security of digital TV services. CAS is responsible for completing user authorization control and management information acquisition, generation, encryption, transmission and program scheduling control, ensuring that only authorized Users can watch the program. The basic principle is: the CAS front-end system uses the control word CW to scramble the program data, and encrypts the CW to generate the authorization control information ECM. At the same time, the CAS front-end system generates different authorization management information EMM for different users; the CAS terminal receives Scramble the program data, ECM and EMM, decrypt the EMM to get the authorization information, use the authorization...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the current CAS terminal cannot obtain authorization in time, which affects the user's use of digital TV services, and the operator is troublesome in performing individual authorization operations for users, and proposes a system and method for realizing the timely authorization of the CAS terminal. The CAS terminal can obtain authorization information in time when it is turned on at any time, ensuring that users enjoy the rights and interests of digital TV services and a good experience, without manual authorization intervention, reducing the workload of operators and users, and easy to use

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