A digital video communication system includes, at a source site, an embedding
circuit
for embedding a digital watermark in a digital video stream to produce a watermarked
digital video stream, and a multiplexer for multiplexing a text data stream with
the watermarked digital video stream to produce a multiplexed signal. At a sink
site, the system includes a demultiplexer for demultiplexing the multiplexed signal
for recovering a watermarked digital video stream and a text data stream. A digital
watermark detector is provided for detecting the digital watermark embedded in
the recovered digital video stream. A synchronizer responds to the detected digital
watermark for synchronizing the recovered text data stream to the recovered video stream.
