Digital rights management (DRM) is a set of business models and technologies that allows media companies to protect their intellectual property -- and profit in the online world. Cowritten by DRM pioneer William Rosenblatt, this lucid primer outlines the state of DRM today for media executives and IT decision-makers, covering business models (such as subscriptions), core technologies (watermarking, encryption, authentication), standards (such as XrML), vendors, and more.