DVD-Audio Requirements
An International Steering Committee (ISC) consisting of the IFPI, RIAA and the RIAJ with the major international music companies, produced a set of recommendations in May 1996:
Copy protection system.
Copyright Identification must include the ISRC.
Anti-Piracy Measures to include SID codes.
Compatible with CD format
DVD-Audio discs to carry audio, video and data.
Conditional Access to additional content on the discs.
Six audio channels of the highest possible sound quality.
Accessibility & Disc Functions better than CD players.
Packaging must not involve a disc caddy.
Disc durability should be greater than CDs
Slide show during audio playback.
One-sided 12-cm disc is favoured.
Minimum playing time at maximum quality 74 minutes
http://www.disctronics.co.uk/technology/dvdaudio/dvdaud_intro.htm