For example, HDCP is a DRM scheme where Intel convinces (or legally requires) every manufacturer of HDMI output devices (e.g. set-top boxes, Blu-ray players) in the world to encrypt certain video streams.

Then, Intel requires manufacturers of HDMI input devices (e.g. TVs) to purchase a license key that can decrypt those video streams. This license agreement also requires the manufacturer to design their device such that the device key cannot be easily discovered and the video content cannot be easily copied.

Then, Intel gets media companies to include some extra metadata in video media like Blu-ray discs. This metadata can contain revoked device keys, so that if a TV manufacturer violates the terms of the license agreement (e.g. leaks their key, or sells a device that makes copies of video content), that manufacturer's TVs won't be able to play new content that starts including their key in the revocation list.

Of course, Intel's HDCP master key was either leaked or reverse-engineered, so anyone can generate their own valid device keys. Intel will probably sue you if you do this, I guess.