Owing to the use of fully mature digital video broadcast technology, the scheme has high security, simple framework, and low cost.
由于充分利用了成熟的数字视频广播技术，此分级授权收视系统安全性很高，系统构建简单，且成本比较适中。
Owing to the use of fully mature digital video broadcast technology, the scheme has high security, simple framework, and low cost.
由于充分利用了成熟的数字视频广播技术，此分级授权收视系统安全性很高，系统构建简单，且成本比较适中。
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