Granted Patent
Utility
US 4,683,968 · App. 06/771,901
System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules
Inventors:
Matthew A. Appelbaum, David Lehman, Donald J. Nieglos, Stanley C. Nolte, Michael Oehler
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Sep 3, 1985
Inventors
Matthew A. Appelbaum
David Lehman
Donald J. Nieglos
Stanley C. Nolte
Michael Oehler
Assignee (at issue)
Burroughs, 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.