(under subclass 365) Subject matter wherein a property or condition of the original prevents a copy from being made thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
80, for accounting of user access during machine operation.
SEE OR SEARCH CLASS
283, Printed Matter, Cross-Reference Art Collection 902 for antiphotocopy.
380, Cryptography,
51, for cryptography with production of printed copy. OTHER CLASSIFICATION SYSTEMS:
ipc{2}G03G21/04, for preventing copies being made of an original.
jpofiG03G21/00 550, for prevention of producing counterfeits by electros:graphic copying. G03G21/00 552, by registering the original picture. G03G21/00 554, by recording an identification mark on the original picture. G03G21/00 560, by modifying a copied picture from the original picture. G03G21/00 562, by supplying an identification code of copying machine to the copied picture.
epcG03G21/04, for preventing copies being made of an original.
