I just got a new Apple TV 4th gen and for some reason it refuses to play movies from iTunes over Airplay. I noticed in iTunes that when I have my Apple TV connected under the Airplay icon the small Apple TV icon displayed next to the devices name has a lock on it. I'm guessing this is why it is not using Airplay to stream my movies over my local network. I've tried doing a Google search for others with the same issue, but nobody seams to have figured out why this lock icon appears. Any ideas? Thanks for any advice.