05638443 is referenced by 828 patents and cites 28 patents.

A system for controlling use and distribution of composite digital works. A digital work is comprised of a description part and a content part. The description part contains control information for the composite digital work. The content part stores the actual digital data comprising the composite digital work. The description part is logically organized in an acyclic structure, e.g. a tree structure. For a composite digital work each node of the acyclic structure represents an individual digital work or some distribution interest in the composite digital work. A node in the acyclic structure is comprised of an identifier of the individual work, usage rights for the individual digital work and a pointer to the digital work. Composite digital works are stored in repositories. A repository has two primary operating modes, a server mode and a requester mode. When operating in a server mode, the repository is responding to requests to access digital works. When operating in requester mode, the repository is requesting access to a digital work. A repository will process each request to access a composite digital work by examining the usage rights for each individual digital work found in the description part of the composite digital work.

Title
System for controlling the distribution and use of composite digital works
Application Number
8/344776
Publication Number
5638443
Application Date
November 23, 1994
Publication Date
June 10, 1997
Inventor
Peter L T Pirolli
El Cerrito
CA, US
Daniel G Bobrow
Palo Alto
CA, US
Mark J Stefik
Woodside
CA, US
Agent
Richard B Domingo
Assignee
Xerox Corporation
CT, US
IPC
G06F 11/34
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