Method of and apparatus for embedding data into an electronic do

Details Method of and apparatus for embedding data into an electronic do Method of and apparatus for embedding data into an electronic do

1996-12-13

1999-01-19

Gross, Anita Pellman

Registers

Coded record sensors

Particular sensor structure

235436, G06K 710

Patent

active

058616195

ABSTRACT:
In a method of coding an electronic text document, the length of a space preceding a word in a line of text data of an electronic document relative to the length of a space following the word is modulated with the value of a bit of signature data. The signature data are thus embedded into the text data of the electronic document, not being easily discernible to illicit readers.

REFERENCES:
patent: 5467447 (1995-11-01), Vogel
patent: 5629770 (1997-05-01), Brassil et al.
"Electronic Marking and Identification Techniques to Discourage Document Copying", J. Brassil, et al., IEEE Transactions No. 0743-166X/94, pp. 1278-1287, 1994.

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