Er, if they are transmitting data to a multicast IP address, what's to stop you doing the same? If they haven't done a check on the IP address that they are re

Er, if they are transmitting data to a multicast IP address, what's to stop you doing the same? If they haven't done a check on the IP address that they are receiving the data from, then it would now be trivial to panic people in elevators by recording a fake emergency broadcast. Not jus that, but what else is that hooked up to? If they are multicasting to your IP address and your IP address isn't the lift, then you can do some IGMP snooping to see what else there is out there. Or you could do a DoS on the lifts to see what happens. Of course, it might be nothing. But when I get in a lift, I'd hope this sort of thing wasn't possible.