Inventor
GUSTAFSON KENNETH I
US3 patents
Patents
3 patentsUS4738901AApr 19, 1988
Method and apparatus for the prevention of unauthorized copying of documents
XEROX CORP42 citations90
US4678322AJul 7, 1987
Method and apparatus for the prevention of unauthorized copying of documents
XEROX CORP33 citations90
US4748480AMay 31, 1988
Controlled authentic document recognition equipment
XEROX CORP15 citations67