Granted Patent
Utility
US 6,714,921 · App. 09/778,006
System for controlling the distribution and use of digital works using digital tickets
Inventors:
Mark J. Stefik, Peter L. T. Pirolli
Patented Case
View Patent ↗
Granted: Mar 30, 2004
Filed: Feb 7, 2001
Inventors
Mark J. Stefik
Peter L. T. Pirolli
Assignee (at issue)
CONTENTGUARD HOLDINGS, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.