Document copying deterrent method

Details Document copying deterrent method Document copying deterrent method

G - Physics

06

K

G06K 1/12 (2006.01) G03G 21/04 (2006.01) G07D 7/00 (2006.01) G07D 7/20 (2006.01) G07F 7/12 (2006.01) H04N 1/32 (2006.01)

Patent

CA 2136166

The present invention is directed to a method of deterring the illicit copying of electronically published documents. It includes utilizing a computer system to electronically publish a plurality of copies of a document having electronically created material thereon for distribution to a plurality of subscribers and operating programming within the computer system so as to perform the identification code functions. The steps are to encode the plurality of copies each with a separate, unique identification code, the identification code being based on a unique arrangement of the electronically created material on each such copy; and, creating a codebook to correlate each such identification code to a particular subscriber. In some embodiments, decoding methods are included with the encoding capabilities. The unique arrangement of the electronically created material may be based on line-shift coding, word-shift coding, or feature enhancement coding (or combinations of these) and may be effected through bitmap alteration of document format file alteration.

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