Digital Restrictions Management is the practice of imposing technological restrictions that control what users can do with digital media. When a program is designed to prevent you from copying or sharing a song, reading an e-book on another device, or playing a single player game without an Internet connection, you are being restricted by DRM. In other words, DRM creates a damaged asset; it prevents you from doing what would be possible without it. This concentrates control over media production and distribution, giving DRM vendors the power to massively record digital books and conduct large-scale surveillance of people's media viewing habits.
Warez is the term used to refer to the illegal sharing and trade of products under the protection of copyright - an activity also described as hacking.