I would think that it is feasible to produce an integrated
camera/transmitter (in fact I think they already have these).
The outgoing video should be time sequenced and encrypted.
If it is tightly enough integrated with some self-checks for
things like changes in impedances, you aren't going to be able
to "hack-in" and divert the transmitter video feed. If the
outgoing data sequence is time-stamp encoded, you aren't going
to switch the feed to a different video unit.
If people can make secure electronic transactions, they ought
to be able to make secure video feeds (after all, it only has
to go one way, while electronic transactions have to go in
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