Method and system for identifying documents generated by an unau

Details Method and system for identifying documents generated by an unau Method and system for identifying documents generated by an unau

1994-10-05

1996-10-22

Cain, David C.

Cryptography

Cryptanalysis

380 23, 380 52, 380 18, 380 4, 382317, 283 92, 283 91, H04L 900

Patent

active

055685501

ABSTRACT:
Each copy of software is assigned a unique identifying code pattern which is printed on all documents produced with that software by a high resolution printer. The unique identifying code pattern is a plurality of spaced apart marks having a size no greater than about 300 dpi, and is therefore, at best, barely noticeable to the human observer. The "invisible signature" is also reproduced on documents made by unauthorized copies of software which can therefore be traced. Preferably, the unique identifying code is replicated multiple times over the document using an error correcting code to assure that at least one replication will be clear of matter selected for printing by the software. A high resolution scanner extracts and identifies the code patterns printed on the document. In systems where the software generates a print file for the high resolution printer, print commands for the pattern replications are interspersed with the other print commands making identification and removal of the commands very difficult and not worth the effort since the "invisible signature" does not prevent copying of the software or noticeably detract from the appearance of the finished document.

REFERENCES:
patent: 4184700 (1980-01-01), Greenaway
patent: 4504084 (1985-03-01), Jauch
patent: 5031214 (1991-07-01), Dziewit et al.
patent: 5080479 (1992-01-01), Rosenberg
patent: 5134669 (1992-07-01), Keogh et al.
patent: 5140650 (1992-08-01), Casey et al.
patent: 5149140 (1992-09-01), Mowry, Jr. et al.

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