An anti-copy film is disclosed. The film has a light transmissive
imageable substrate having opposing first and second surfaces. Each
surface has an image receptive coating. Complementary positive and
negative images are disposed on the first and second surfaces such that
an imaged area on the first surface is in registration with a non-imaged
area on the second surface. The anti-copy film appears substantially
opaque when viewed orthogonally to and appears partially transparent when
viewed obliquely to either the first or second surfaces.