Selectable Output Control

Selectable Output Control (SOC) is a content protection Digital Rights Management (DRM) technology that is incorporated into approved devices that enables a Multichannel Video Programming Distributor (MVPD) to disable non-secure audio-video output by encoding the video with a specific signal. SOC aims to limit the output of high definition video over non-secure analog outputs such as component video connections.

Source: Wikipedia — Selectable Output Control (CC BY-SA 4.0)