The screen of my iphone froze, I cant restart the iphone, what am I supposed to do?

The screen of my iphone froze, I cant restart the iphone, what am I supposed to do?

Welcome to the Apple Community.
HDCP is copy protection built into iTunes video content, the Apple TV requires all devices to be HDCP compatible before it will send HDCP content to them. In simplistic terms the Apple TV asks the TV if the signal it will send can be recorded, if it gets the right answer it will send the signal, if it doesn't receive a reply it won't.
Your problem may be one of unsupported equipment or may simply be an error. You could start by checking if your TV is HDCP compliant. If it is the problem might be cabling or another device (such as a receiver) between the Apple TV and TV, it may also just be a glitch which might be resolved by a simple restart.

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