Granted Patent
Utility
US 6,539,475 · App. 09/215,960
Method and system for protecting digital data from unauthorized copying
Inventors:
Ingemar J. Cox, Matthew L. Miller
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Dec 18, 1998
Inventors
Ingemar J. Cox
Matthew L. Miller
Assignee (at issue)
NEC CORPORATION
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.