DRM
also: Digital Rights Management, DRM subsystem, kernel DRM
Digital Rights Management (DRM) is a technology that restricts how users can copy, modify, or distribute digital content by enforcing access controls at the software or hardware level.
DRM implements encryption and licensing mechanisms to prevent unauthorized copying or modification of protected content. In Linux, DRM also refers to the kernel subsystem that manages graphics hardware access and display rendering.
In a content context, DRM might prevent you from copying a video file or require authentication before playing protected media. For example, streaming services use DRM to ensure only authorized subscribers can watch their content.
In the kernel context, the DRM subsystem (found in /drivers/gpu/drm/) abstracts graphics hardware for display servers and compositors. It manages frame buffers, display modes, and GPU memory, allowing multiple graphics drivers to work with the kernel consistently.
The tension between DRM and Linux users exists because restrictive DRM can limit interoperability and right-to-repair principles, while kernel DRM is simply essential infrastructure for modern graphics support.