DRM
Short for Digital Rights Management, DRM is a technology designed to help protect copyrighted material from being used, read, or shared without the proper rights. DRM is often achieved through the use of a digital watermark or encryption. Although many believe DRM is the solution to protecting copyrighted material on computers, many others also believe that DRM is restrictive and may prevent users from doing such things as making backups or other copies for their own personal use.
Also see: Cell phone definitions, Copyright, CSS, HDCP, Security definitions