Digital television program stream sharing method, device, terminal and system

Abstract

The invention discloses a digital television program stream sharing method. The method comprises the following steps of receiving a program stream request instruction sent by a sharing user terminal in a local area network; decrypting the program stream of the program stream request instruction by a CA decrypting card and distributing the decrypted program stream to the corresponding sharing user terminal, thereby broadcasting the program stream on the sharing user terminal. The invention further discloses a stream sharing service unit, a digital television stream sharing service terminal and a digital television stream sharing system. The program stream is decrypted by the digital television program stream sharing method and the CA decrypting card, and the decrypted program stream is respectively distributed to the corresponding sharing user terminal, so that the digital television program can be simultaneously watched through one CA decrypting card and multiple sharing user terminals in the same local network.

Description

technical field [0001] The invention relates to the field of digital television, in particular to a digital television program stream sharing method, device, terminal and system. Background technique [0002] With the development of digital TV technology, more and more users use digital TV program viewing services. The broadcast TV system consists of two parts: the broadcast front end and the receiving terminal. The encryption work of the scrambling key, so that the transmitted program data is changed from plain code to password. The scrambled data is useless to unauthorized users, and the authorized users are provided with information for descrambling. These information are reproduced in encrypted form. When it is used in the MPEG-2 transport stream, the authorized user can obtain the descrambling key (that is, control word CW, Control word) after decrypting it and realize descrambling and decoding of the signal. The receiving terminal completes decryption and descrambling...

AI Technical Summary

Problems solved by technology

[0004] Technologies such as Mircast, DLNA, and Mirror utilize LAN to transmit media resources or other service resources received by digital TV receiving terminals. program stream sharing solutions, such as program stream sharing based on LNB or program stream sharing based on the various data ID (PID) cache files contained in the extracted channel, the existing technology can only realize the media resources that have been stored in the current receiving terminal sharing, or the sharing of a program that is currently playing, when there are multiple user terminals, it cannot be realized that multiple user terminals can watch different programs at the same time, and the CA system is not supported

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