Televiewing control method and device

Abstract

The invention provides a televiewing control method and device. The method comprises the following steps of: receiving a data packet sent from the front end, wherein information carried in the data packet comprises a flow value and a limit value; making a statistics for a current accumulated flow value of the received data packet; judging whether the current accumulated flow value exceeds to the limit value or not; and not processing the data packet if the judging result is positive. The invention effectively limits the quantity of different program streams simultaneously decrypted by a safety device, thereby limiting the quantity of digital programs descrambled by a terminal, that is to say, limiting the quantity of programs viewed by a terminal user, preventing continuously televiewing a plurality of sets of programs by using one card, effectively protecting the vital interests of service providers and guaranteeing the legitimate rights and interests of the service providers.

Description

technical field [0001] The invention relates to digital television technology, in particular to a digital television viewing control method and device thereof. Background technique [0002] At present, a conditional access system (CAS: Condition Access System) is a system for controlling users to receive broadcast services, and realizes paid services of the broadcast system through authorization management. [0003] The conditional access system controls the broadcast service by scrambling the broadcast data and encrypting the scramble control information. [0004] like figure 1 As shown, the front end uses the product key to encrypt the control word CW, and transmits it in the entitlement control message (ECM: Entitlement Control Message). The front end uses the user key to encrypt the product key, and sends the encrypted product key to the terminal set-top box through the EMM data packet. [0005] The set-top box filters the EMM data packet according to the security dev...

AI Technical Summary

Problems solved by technology

[0008] The inventor finds that the defect of the prior art lies in that in the process of realizing the present invention: the existing digital TV terminal does not impose any restrictions on the flow rate of each program watched, so if an illegal user maliciously uses the security device for many times When receiving at least one program, the security device needs to perform operations such as decrypting it multiple times, resulting in a large workload; in addition, when receiving multiple programs, the security device needs to store a large number of program keys and product keys and other information related to each program. Therefore, due to the limitation of the processing power and storage capacity of the security device, the security device cannot guarantee the operation stability and security, thus damaging the interests of the majority of users and also damaging the operation. business interests

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