Multiple-CA (conditional access) simulcrypt system and method

Abstract

Disclosed is a multi-CA simulcrypt system, comprising: a CA common server, several CA servers, a scrambling machine and several digital television terminals, wherein the CA servers perform two-way communication with the CA common server, the CA common server performs two-way communication with the scrambling machine, and the scrambling machine performs one-way communication with the digital television terminals. The CA common server receives a control word from the scrambling machine, and sends the control word to the CA server connected thereto; at the same time, the CA common server processes received entitlement control information and entitlement management information from the CA server to generate new entitlement control information and entitlement management information, and sends the new entitlement control information and entitlement management information to the scrambling machine; and the scrambling machine sends the received entitlement control information and entitlement management information to the digital television terminals. The present invention adds or replaces a simulcrypt CA system simply and conveniently without setting and debugging again, and solves the problem of limitation on the number of simulcrypt CA systems.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to a multi-CA simultaneous encryption system and method. Background technique [0002] Simulcrypt is an encryption method for digital TV, which means that two or more CA (Conditional Access, Conditional Access) systems scramble or encrypt the same TS stream. The simulcryption standard of the DVB-CA system stipulates that all CA manufacturers must comply with the CSA (Common Scrambling Algorithm: Common Scrambling Algorithm) to realize the scrambling / descrambling of video, audio and data information, and at the same time, all CA manufacturers must develop their own ECM (Entitlement Control Message, entitlement control information) and EMM (Entitlement Management Message, entitlement management information) control programs to realize the entitlement control and management of user set-top boxes. Simulcrypt allows multiple CA systems to exist in the same operating network, ...

AI Technical Summary

Problems solved by technology

This method can realize multi-CA system simulcryption, but there are certain defects

Due to the limited interface between the scrambler and the CA server, the number of CA servers that can be connected is limited, and the number of CA systems that can be encrypted is limited

In addition, in the current simulcryption method, every time a simulcrypted CA system is added or replaced, it is necessary to change the simulcrypt setting of the scrambler and re-debugging, and a large number of problems often occur during the debugging process. It is very troublesome to replace the CA system of simulcryption

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