| 摘要 |
The preferred method involves the use of an embedded data field within the video stream to transport a predetermined/known source string of data which in normal operation is carried intact through the entire head-end, grooming, distribution and access portions of the provider's network. An element or multiple elements are positioned at one or more points in the network. The elements continually monitor the stream to verify that a predetermined data string is located in the embedded data field.
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