A 4K Food Chain

If your TV is hungry for 4K resolution content here is an overview of some ways to get it and the technology required to display it.

Content. Where to get it. How it gets to the TV. HDCP (usually) required. Showing it (Decoding).
Video clips, channels Youtube Internet No WebM (VP9), H264
Movies Netflix, Amazon Prime, others Internet Yes H.264
Movies Blu-ray HDMI, Display Port cable Yes H.265 (in player)
Exclusive content Netflix, Amazon Prime Internet No H.264
TV Shows TV Stations Antenna Probably not ATSC 3.0

ATSC 3.0 is a broadcast to air TV standard. The first TV to support 4K Ultra HD using ATSC 3.0 was introduced in January 2017. ATSC 3.0 was given the go ahead for use North America in February 2017, and broadcasters are now experimenting with transmissions.

H.264, H.265 and WebM are video encoding standards commonly used in streaming. H.265 is gradually replacing H.264 for streaming as it offers a more practical solution for 4K streaming.

HDCP is a method used to protect content from being copied. If a video requires an HDCP session then all connections like HDMI and Display Port must meet this requirement for us to display high resolution video.