Sony VAIO Viao PictureBook Computer - Manual (Page 45)

Connecting the Port Replicator
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Retail videos played back on a DVD player or VCR and videos received via a digital CS
tuner contain copyright protection signals and cannot be displayed or recorded. If you
use the AV In jack on the port replicator to import a video containing copyright
protection signals, the video input image turns black to disable video display or record
functions.
Analog signals from video playback may also produce electronic "noise" distortions
that can disable video display or record functions.