| 摘要 |
The present invention teaches methods, systems and articles of manufacture for embedding information within the vertical blanking interval (VBI) of a video signal. Such embedded data may be operative for the control of a set-top-box receiver, VCR, DVD player/recorder, computer or television, or may contain software which may be installed on a receiver unit. Embedded data may include electronic signatures which identify the source of a video signal and may be used as a copy-protection message. The information is inserted into closed caption (CC1) bandwidth. The term CC1 bandwidth refers to the capacity for insertion of closed caption data within Channel 1 of the Line-21 (VBI) of the video program. The CC1 band is especially suited for use in embedding data both because CC1 data is invisible to content viewers and because the United States and other nations require CC1 content to be transmitted with all publicly distributed video content.
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