Content is distributed from a source to a sink only if the sink is within
a predetemined distance from a source. In one embodiment, a control
signal is sent over a limited range channel to the sink and the content
is then sent only if the control signal is received properly by the sink.
In another embodiment, the content is encrypted and the encryption key is
sent over the limited range channel. The content is also sent to the
sink, but the sink cannot decode the content unless it has a proper copy
of the decoding key. The control signal can be sent over a wireless
channel, an IR channel, or an AC line. The content is sent over the
Internet, either using a standard wired channel or over a wireless
channel.
