Patent US3979490A successfully refreshed from Google Patents.
Patent EP0629972A2 successfully refreshed from Google Patents.
EP0629972A2
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EP
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Method and apparatus for embedding identification codes in printed documents
Assignee: HP Inc
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Filing: 1994-02-22
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Granted: —
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Expires: 2014-02-22
Abstract
Abstract A method and apparatus (1203, 1403) for embedding identification information in documents. The present invention embeds information in each copy of a document (1207, 1407) such that a particular copy of the document is distinguishable from all other copies of the same document. Additionally, this embedded information (1209, 1301, 1409) is designed to remain intact even if the original is copied. A method and apparatus is also disclosed to embed verification information in a printed document (1207, 1407) such that modification to the text subsequent to printing is detectable.
Inventors
- 👤 Michael J. Mahon
- 👤 Jerome C. Huck
- 👤 Dale C. Morris
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:53
CPC Classifications
G; G06; G06K; G06K1/00; G06K1/12; G06K1/121; B; B41; B41M; B41M3/00; B41M3/14; G06K15/00; G06K15/02; G06K19/00; G06K19/06; G06K19/06009; G06K2215/00; G06K2215/0002; G06K2215/004; G06K2215/0054
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
An apparatus for embedding a number in a document comprising: a text generator having an output of text characters wherein the text characters utilise a base font (Fig.1); and a code embedder which embeds a code by modifying (Figs. 2-8) the base font (Fig.1) of a text character.
Claim 2
Dependent Claim
32 words
An apparatus as in claim 1 wherein: the code embedder embeds a code by modifying the base font (Fig.1) of a text character by changing the size (Fig 8,2) of the character.
Claim 3
Dependent Claim
32 words
An apparatus as in claim 1 wherein: the code embedder embeds a code by modifying the base font (Fig.1) of a text character by changing the shape (Fig 2-8) of the character.
Claim 4
Dependent Claim
24 words
An apparatus as in claim 1 further comprising: a printer (1205,1405) that prints the text characters including the text character having an embedded code.
Claim 5
Independent Claim
43 words
An apparatus for embedding a number in a document comprising: a text generator (1203) having an output of text characters; and a code embedder which embeds a code by changing one of the text characters (Fig 12 "key") into a different character (1209).
Claim 6
Dependent Claim
26 words
An apparatus as in claim 5 further comprising: a printer (1205, 1405) which prints the text characters including the character4r (1209, 1411) having an embedded code.
Claim 7
Independent Claim
72 words
An apparatus for embedding a number in a document comprising: a text generator having an output of text characters and wherein the text characters form lines of text characters and the lines of text characters are space vertically apart and the text characters in a line are spaced horizontally apart; and a code embedder which embeds a code by changing the spacing of a text character (901, 1001) relative to a reference.
Claim 8
Dependent Claim
30 words
An apparatus as in claim 7 wherein: the code embedder embeds a code by changing the vertical spacing of a line (1303, 1307) of text characters relative to a reference.
Claim 9
Dependent Claim
29 words
An apparatus as in claim 7 wherein: the code embedder embeds a code by changing the horizontal spacing of a text character (901, 1001, 1105) relative to a reference.
Claim 10
Dependent Claim
28 words
An apparatus as in claim 7 wherein: the code embedder embeds a code by changing the vertical spacing of a text character (1303, 1307) relative to a reference.
Claim 11
Dependent Claim
30 words
An apparatus as in claim 7 further comprising: a printer which prints the output of text characters and prints the text character having a changed spacing with the changed spacing.
Claim 12
Dependent Claim
45 words
An apparatus as in claim 7 further comprising: a text verifier generating a check code determined by the output of text characters and; the check code is embedded by the code embedder by changing the spacing of a text character (Fig.13) relative to a reference.
Claim 13
Dependent Claim
47 words
An apparatus as in claim 5 further comprising: a text verifier generating a check code determined by the output of text characters and; the check code is embedded by the code embedder by changing one of the text characters (Fig 12 'ker') into a different character (1209).
Claim 14
Dependent Claim
43 words
An apparatus as in claim 1 further comprising: a text verifier generating a check code determined by the output of text characters and; the check code is embedded by the code embedder by modifying the base font (Fig.1) of a text character (1409).
References Cited (Backward Citations)
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