Research on the defects and solutions of satellite digital TV system Chen Guoping (Nanjing Vocational and Technical College of Information Technology, Nanjing 210046) Abstract: With the rapid development of home digital satellite TV, digital satellite encrypted TV has gradually entered thousands of households. To receive satellite encrypted TV, you must have a decryption card provided by the satellite operator. The current decryption card is expensive. There is a phenomenon in the market where providers illegally share the control word CW (Control Word) information of the genuine decryption card with multiple users at a low price and make huge profits. This article conducts a professional analysis of the reasons that lead to the sharing of the control word CW, and proposes six solutions to effectively deal with the defects of the system, so as to effectively combat shared service providers, protect the legitimate rights and interests of satellite operators, and promote the healthy development of digital satellite encrypted TV. Keywords: digital satellite TV, control word CW, conditional access system, copyright protection, digital watermark
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