HDCP
HDCP (High-bandwidth Digital Content Protection) is a copy protection standard that encrypts video as it travels over a cable, such as HDMI or DisplayPort, from a playback device to a screen. It stops protected video from being captured by a recording device placed between the player and the TV or monitor. If a connected screen does not support HDCP, playback may be blocked or reduced in quality.
Why it matters
Studios often require HDCP before allowing HD or 4K playback on TVs and external monitors. Without correct HDCP handling, viewers see black screens or error messages on otherwise working setups. Services need fallback rules so viewers with older screens still get something to watch.
How it works
- When a player connects to a screen over HDMI or DisplayPort, the two devices exchange keys to confirm both support HDCP.
- If the check passes, the video signal is encrypted as it travels over the cable.
- The screen decrypts and displays it, so a recorder in the middle sees only scrambled data.
- If the check fails, the DRM can block playback or limit it to a lower resolution.
Why do I get an HDCP error on my TV?
An HDCP error usually means one device in the chain, such as a TV, monitor, receiver, adapter or capture card, does not support the HDCP version the content requires. Reconnecting the cable, removing adapters or splitters and connecting the player straight to the TV often fixes it. Older screens may lack HDCP 2.2, which 4K content usually needs.
Do I need HDCP 2.2 for 4K?
Usually yes. Most 4K streaming content requires HDCP 2.2 or later on every device between the player and the screen. If any link supports only an older version, the service may drop to HD or block playback. Check the HDMI port labels on TVs and receivers, since sometimes only certain ports support HDCP 2.2.
Where it's used
OTT services and premium movie rental services enforce HDCP because studios require it for HD and 4K on TVs, falling back to SD instead of blocking when a screen lacks it.
By the numbers
- HDCP was developed by Intel, and its subsidiary Digital Content Protection LLC licenses the technology. (Wikipedia: High-bandwidth Digital Content Protection)
- HDCP 2.2 was released on October 16, 2012, with a version for HDMI following on February 13, 2013. (Wikipedia: High-bandwidth Digital Content Protection)
- MovieLabs' Enhanced Content Protection specification requires support for HDCP 2.2 or better for Ultra HD content. (MovieLabs Specification for Enhanced Content Protection v1.2)
