No, this is not about one of my lectures. A drone is an unmanned aircraft. They are mainly used for military purposes, but I suspect we will see more civilian uses as time goes by. A drone knows where it is by receiving GPS signals. This week, people (experts at the University of Texas) have “spoofed” a drone by sending it fake GPS signals. Then you can force the drone to think it is somewhere else, and therefore you can control it:
Drone Article at BBC
This drone receives GPS signals that are not encrypted. Apparently civilian aircraft also receive unencrypted GPS signals, which I find slightly worrying. Military drones would use encrypted signals, so they are harder to spoof. If you can break the encryption, you can spoof those too. I wonder what kind of encryption they use.