US5920878A
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Method for hiding a binary encoded message in an electronic document by modulating the case of the characters in a case-insensitive markup language
Assignee: Achates Reference Publishing Inc
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Filing: 1996-11-14
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Granted: 1999-07-06
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Expires: 2016-11-14
Abstract
Abstract Embodiments of the present invention are capable of hiding a message, such as, for example, a copyright notice or other indicium of authorship, in an electronic document. An illustrative embodiment of the present invention comprises encoding an electronic document with a plurality of tags from a case insensitive markup language; and modulating the case of at least one tag character in at least one of said plurality of tags with a binary string, wherein the binary string represents a message to be hidden in the electronic document.
Inventors
- 👤 Jason Paul DeMont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:55
CPC Classifications
G; G06; G06F; G06F40/00; G06F40/10; G06F40/12; G06F40/123
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
55 words
A method comprising: encoding an electronic document with a plurality of tags from a case insensitive markup language; and modulating the case of at least one tag character in at least one of said plurality of tags with a binary string, wherein said binary string represents a message to be hidden in said electronic document.
Claim 2
Independent Claim
55 words
A method comprising: encoding an electronic document with a plurality of tags from a case insensitive markup language; and modulating the case of at least one tag character in at least one of said plurality of tags with a binary string, wherein said binary string represents a message to be hidden in said electronic document.
Claim 3
Dependent Claim
14 words
The method of claim 1 further comprising encoding said binary string with error correction.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein said message represents text.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said message is a copyright notice.
Claim 6
Independent Claim
58 words
A method comprising: encoding an electronic document with a plurality of tags from a case insensitive markup language; reducing a message to be hidden in said electronic document to a binary string; selecting a nonempty subset of said plurality of tags; and modulating the case of said nonempty subset of said plurality of tags with said binary string.
Claim 7
Independent Claim
58 words
A method comprising: encoding an electronic document with a plurality of tags from a case insensitive markup language; reducing a message to be hidden in said electronic document to a binary string; selecting a nonempty subset of said plurality of tags; and modulating the case of said nonempty subset of said plurality of tags with said binary string.
Claim 8
Dependent Claim
14 words
The method of claim 5 further comprising encoding said binary string with error correction.
Claim 9
Dependent Claim
10 words
The method of claim 5 wherein said message represents text.
Claim 10
Dependent Claim
12 words
The method of claim 5 wherein said message is a copyright notice.
Claim 11
Independent Claim
60 words
A method of recovering a message hidden in an electronic document comprising: demodulating the case of at least one tag character in at least one of a plurality of tags in said electronic document to recover a binary string, wherein said plurality of tags are from a case insensitive markup language; and converting said binary string into said hidden message.
Claim 12
Independent Claim
60 words
A method of recovering a message hidden in an electronic document comprising: demodulating the case of at least one tag character in at least one of a plurality of tags in said electronic document to recover a binary string, wherein said plurality of tags are from a case insensitive markup language; and converting said binary string into said hidden message.
Claim 13
Dependent Claim
16 words
The method of claim 9 further comprising correcting said binary string with an error correction code.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-05 | 2003-01-04 | 2003-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-05 | 2007-01-04 | 2007-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-05 | 2011-01-04 | 2011-07-06 | $7700.00 | Window Closed / Lapsed |