ABSTRACT
This chapter outlines the history of this effort and concludes with some discussion of a possible future direction. It focuses on the technical aspects of specific content protection schemes. Digital rights management in consumer electronics devices, to date, is about restricting unauthorized copies. The chapter describes MacroVision works in the analog domain and requires no secrets and no device license, because it is based on fundamental differences between Television and Video cassette recorders. The Content Scrambling System works by assigning each device manufacturer a single key. Divx was implemented by requiring the player to have a phone connection to a clearinghouse and periodically to call and report usage. Called Digital Transmission Content Protection, it is available on Firewire, on the Universal Serial Bus, and on any transmission technology that supports Transmission Control Protocol/Internet Protocol. Ideally, the personal digital domain content protection should be completely transparent to the average consumer.
