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In my limited experience of one system, every digital
satellite tv receiver has a serial number through which
channels can be enabled, or the whole thing blocked by
the transmitting satellite.
So, if you want people to watch something particular, use
this system to ask random receivers to
call the winning
telephone number within 1 minute.
||good title, good summary, absolutely no idea whatsoever as to what the other stuff is about.
||So you'd block everyone except the winner for a
moment, and say "you've won, call this number" on
||I don't think the blocking system works immediately,
I was under the impression that it is concurrent with
||I don't think blocking is necessary...I get an individusl
message to tell me when I have forgotten to pay,
which seems to demonstrate the system somewhat.
||So, it would be a general satellite transmission,
received by all, but decoded by one. Final confirmation
required by handing over the hardware.