HDCP (High-bandwidth Digital Content Protection) encrypts the video signal on the physical link - HDMI or DisplayPort - between a playback device and the screen, so the decrypted picture cannot be captured by a device spliced into the cable. It is the last leg of content protection, beyond DRM's job of protecting the stream.
DRM license policy frequently mandates a minimum HDCP version (e.g. HDCP 2.2 for 4K/UHD). If the connected display or cable does not satisfy it, the platform must downgrade resolution or refuse playback. This is why a 4K stream may drop to HD on an older TV or through a non-compliant adapter - the entitlement and license layers are enforcing the studio's output-protection requirement.
The handbook · 7 volumes
Fora Soft Video Engineering Handbook
HDCP protects the HDMI link to the screen, and a failed HDCP handshake is a common cause of black screens on premium 4K titles. We wrote seven volumes covering the video stack; for HDCP start with Volume 3 on DRM, output control, and license policy, then Volume 1 on HDR and 4K encoding, with packaging in Volume 2. Written by Nikolay Sapunov, CEO at Fora Soft.
Studios requiring HDCP for 4K and you need to enforce it without black screens?
We will review your DRM policies and target devices and send an output protection plan with fallbacks per HDCP level. 250+ video products shipped since 2005.
