HK1026796A1 - Forgery-resistant documents with images conveying secret data and related methods - Google Patents

Forgery-resistant documents with images conveying secret data and related methods

Info

Publication number
HK1026796A1
HK1026796A1 HK00105849A HK00105849A HK1026796A1 HK 1026796 A1 HK1026796 A1 HK 1026796A1 HK 00105849 A HK00105849 A HK 00105849A HK 00105849 A HK00105849 A HK 00105849A HK 1026796 A1 HK1026796 A1 HK 1026796A1
Authority
HK
Hong Kong
Prior art keywords
forgery
related methods
secret data
images conveying
resistant documents
Prior art date
Application number
HK00105849A
Inventor
Geoffrey B Rhoads
Original Assignee
Digimarc Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/436,102 external-priority patent/US5748783A/en
Priority claimed from US08/508,083 external-priority patent/US5841978A/en
Priority claimed from US08534005 external-priority patent/US5832119C1/en
Application filed by Digimarc Corp filed Critical Digimarc Corp
Publication of HK1026796A1 publication Critical patent/HK1026796A1/en

Links

HK00105849A 1995-04-25 2000-09-15 Forgery-resistant documents with images conveying secret data and related methods HK1026796A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US63753195A 1995-04-25 1995-04-25
US08/436,102 US5748783A (en) 1995-05-08 1995-05-08 Method and apparatus for robust information coding
US08/508,083 US5841978A (en) 1993-11-18 1995-07-27 Network linking method using steganographically embedded data objects
US51299395A 1995-08-09 1995-08-09
US08534005 US5832119C1 (en) 1993-11-18 1995-09-25 Methods for controlling systems using control signals embedded in empirical data

Publications (1)

Publication Number Publication Date
HK1026796A1 true HK1026796A1 (en) 2000-12-22

Family

ID=32854574

Family Applications (1)

Application Number Title Priority Date Filing Date
HK00105849A HK1026796A1 (en) 1995-04-25 2000-09-15 Forgery-resistant documents with images conveying secret data and related methods

Country Status (1)

Country Link
HK (1) HK1026796A1 (en)

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Legal Events

Date Code Title Description
CHRG Changes in the register

Free format text: ADDITION OF PRIORITY CLAIM: 27.07.1995 US 508083; 09.08.1995 US 512993; 25.09.1995 US 534005; 25.04.1996 US 637531

PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20110507