Patent ID: 7289644

Claim:
A method for identifying a copy of a motion picture disposed on a medium comprising the steps of: expressing a print identifier, P, by a plurality of identifier marks I 4 , where n>2, such that P=I 1 +I 2 M + . . . +I n M n−1 , where I n =Floor((P/M n−1 ) Mod M), M is a constant and an error correction number E is expressed as E=(I 1 +I 2 + . . . +I n ) Mod M; selecting a plurality of motion picture scenes, each of the plurality of motion picture scenes comprising an identifiable portion of the motion picture distinct from every other portion of the motion picture; defining a plurality of sequences within each of the plurality of motion picture scenes, each of the sequences comprising a plurality of frames; and selectively marking the plurality of sequences with the plurality of identifier marks to collectively define an identifiable marking pattern; wherein absent one of the identifier marks the identifiable marking pattern is determinable by processing the error correction number and remaining ones of the identifier marks.