Rick is a member of a user group called the Diablo Valley User Group and they had a shootout between Roku and Apple TV. When he plugged in the Roku 4, though, he got no signal. Could it have been a DRM issue? He's heard that running an HDMI cable through a splitter will strip out the DRM. Leo says it depends on the splitter. Usually sold from China, they can have that advantage, but they can't say so because they'll be blocked.
AppleTV has HDCP, and Rick said it works. So it's probably not a DRM issue. It's more likely an HDMI handshaking issue. It could even be a bad cable.