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Document copying deterrent method

Brassil, John T and Low, Steven H. and Maxemchuk, Nicholas F. and O'Gorman, Lawrence P. (2000) Document copying deterrent method. Patent number: US006086706. http://resolver.caltech.edu/CaltechAUTHORS:20170810-102749497

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Abstract

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.


Item Type:Patent
Related Patents:US5629770A, CA2136166C, EP0660275B1, JP3136061B2, DE69421255T2
Patent Classification:Current U.S. Class: 156/277; 235/375; 235/385; 235/454; 283/901; 360/46; 382/100; 382/307. Current CPC Class: G03G 21/04 (20130101); G07D 7/004 (20130101); G07D 7/20 (20130101); G07F 7/08 (20130101); H04N 1/32203 (20130101); H04N 1/32208 (20130101); H04N 1/32219 (20130101); H04N 1/32261 (20130101); G07D 7/0047 (20170501); H04N 2201/3233 (20130101); H04N 2201/324 (20130101); H04N 2201/327 (20130101); Y10S 283/901 (20130101). Current International Class: G03G 21/04 (20060101); G07D 7/00 (20060101); G07D 7/20 (20060101); G07F 7/12 (20060101); H04N 1/32 (20060101); B32B 031/00 ().
Patent Assignee:AT&T Corp, Lucent Technologies Inc
Related URLs:
URLURL TypeDescription
https://patents.google.com/patent/US6086706APatentGoogle Patents site
http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN/6086706PatentU.S. Patent Office
Additional Information:Publication number US6086706. Publication type US Grant. Publication date July 11, 2000. Application number US08170619. Filing date December 20, 1993. Priority date December 20, 1993.
Record Number:CaltechAUTHORS:20170810-102749497
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170810-102749497
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80081
Collection:CaltechAUTHORS
Deposited By: Linqi Guo
Deposited On:21 Sep 2017 22:42
Last Modified:21 Sep 2017 22:42

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