Mark J. Stefik

System for controlling the distribution and use of rendered digital works through watermarking

System for the distribution and use of digital works

Usage rights grammar and digital works having usage rights created with the grammar

Digital work structure

Method and system for conducting transactions between repositories using a repository transaction protocol

Repository with security class and method for use thereof

Method and apparatus for tracking states of digital works

Composite digital works having usage rights and method for creating the same

Method and apparatus for repackaging portions of digital works as new digital works

Content rendering repository