US6611599B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Watermarking of digital object
Assignee: Hewlett Packard Development Co LP
•
Filing: 1997-09-29
•
Granted: 2003-08-26
•
Expires: 2017-09-29
Abstract
Abstract A technique for identifying digital object using a digital watermark. The technique includes the steps of encrypting a message derived from source data on the digital object, to obtain an encrypted message digest (S); deriving a watermark from the encrypted message digest (S); and incorporating the watermark into the source data. The encryption is preferably done with a public key encryption system. The message to be encrypted can be obtained via performing a hash function on the source data on the digital object to obtain a message digest (M). The message digest (M) is the message encrypted with the signature encryption key to obtain the encrypted message digest (S). The watermark is resistant to cropping, scaling, and truncation.
Inventors
- 👤 Balas K. Natarajan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:04
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0064; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32203; H04N1/32208; H04N1/32251; H04N1/32267; H04N1/32283; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3236; H04N2201/3269; H04N2201/327
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
150 words
A system for identifying a digital object using a digital watermark, comprising: means for obtaining a set of source data from the digital object, the source data comprising a set of data values; means for generating a message digest by applying a function to the source data which is preselected to avoid reconstruction of the source data from the message digest; means for encrypting the message digest to obtain an encrypted message digest; means for deriving a watermark vector from the encrypted message digest; means for determining an average vector of a selected subset of the data values; means for avoiding a dependency between the watermark vector and the average vector by orthogonalizing the watermark vector with respect to the average vector; means for combining the watermark vector with the selected subset of the data values of the source data to obtain a watermarked object that includes the digital watermark.
Claim 2
Independent Claim
150 words
A system for identifying a digital object using a digital watermark, comprising: means for obtaining a set of source data from the digital object, the source data comprising a set of data values; means for generating a message digest by applying a function to the source data which is preselected to avoid reconstruction of the source data from the message digest; means for encrypting the message digest to obtain an encrypted message digest; means for deriving a watermark vector from the encrypted message digest; means for determining an average vector of a selected subset of the data values; means for avoiding a dependency between the watermark vector and the average vector by orthogonalizing the watermark vector with respect to the average vector; means for combining the watermark vector with the selected subset of the data values of the source data to obtain a watermarked object that includes the digital watermark.
Claim 3
Dependent Claim
23 words
The system of claim 1 , wherein the function is preselected such that the message digest contains fewer bits than the source data.
Claim 4
Dependent Claim
34 words
The system of claim 1 , wherein the means for deriving a watermark vector includes means for modulating the encrypted message digest to spread over a portion of a spectrum of the digital object.
Claim 5
Dependent Claim
26 words
The system of claim 1 , wherein the means for encrypting the message digest comprises means for encrypting the message digest using a public key system.
Claim 6
Dependent Claim
178 words
An article of manufacture comprising a program storage medium, tangibly embodying a program code means readable by a computer to cause the computer to identify a digital object using a digital watermark, comprising: code means for obtaining a set of source data from the digital object, the source data comprising a set of data values; code means for generating a message digest by applying a function to the source data which is preselected to avoid reconstruction of the source data from the message digest; code means for encrypting the message digest to obtain an encrypted message digest; code means for deriving a watermark vector from the encrypted message digest; code means for determining an average vector of a selected subset of the data values; code means for avoiding a dependency between the watermark vector and the average vector by orthogonalizing the watermark vector with respect to the average vector; code means for combining the watermark vector with the selected subset of the data values of the source data to obtain a watermarked object that includes the digital watermark.
Claim 7
Dependent Claim
178 words
An article of manufacture comprising a program storage medium, tangibly embodying a program code means readable by a computer to cause the computer to identify a digital object using a digital watermark, comprising: code means for obtaining a set of source data from the digital object, the source data comprising a set of data values; code means for generating a message digest by applying a function to the source data which is preselected to avoid reconstruction of the source data from the message digest; code means for encrypting the message digest to obtain an encrypted message digest; code means for deriving a watermark vector from the encrypted message digest; code means for determining an average vector of a selected subset of the data values; code means for avoiding a dependency between the watermark vector and the average vector by orthogonalizing the watermark vector with respect to the average vector; code means for combining the watermark vector with the selected subset of the data values of the source data to obtain a watermarked object that includes the digital watermark.
Claim 8
Dependent Claim
25 words
The article of manufacture of claim 5 , wherein the function is preselected such that the message digest contains fewer bits than the source data.
Claim 9
Dependent Claim
38 words
The article of manufacture of claim 5 , wherein the code means for deriving a watermark vector includes code means for modulating the encrypted message digest to spread over a portion of a spectrum of the digital object.
Claim 10
Dependent Claim
30 words
The article of manufacture of claim 5 , wherein the code means for encrypting the message digest comprises code means for encrypting the message digest using a public key system.
Claim 11
Independent Claim
61 words
A method for identifying a digital object, comprising the steps of deriving a watermark vector from the digital object; determining an average vector of a selected subset of the digital object; avoiding a dependency between the watermark vector and the average vector by orthogonalizing the watermark vector with respect to the average vector; combining the watermark vector and the digital object.
Claim 12
Independent Claim
61 words
A method for identifying a digital object, comprising the steps of deriving a watermark vector from the digital object; determining an average vector of a selected subset of the digital object; avoiding a dependency between the watermark vector and the average vector by orthogonalizing the watermark vector with respect to the average vector; combining the watermark vector and the digital object.
Claim 13
Dependent Claim
62 words
The method of claim 9 , wherein the step of deriving a watermark comprises the steps of: generating a message digest by applying a function to the digital object which is preselected to avoid reconstruction of the digital object from the message digest; encrypting the message digest to obtain an encrypted message digest; deriving the watermark vector from the encrypted message digest.
Claim 14
Dependent Claim
23 words
The method of claim 9 , further comprising the step of determining an average vector of a selected portion of the digital object.
Claim 15
Dependent Claim
26 words
The method of claim 11 , A wherein the step of orthogonalizing comprises the step of orthogonalizing the watermark vector with respect to the average vector.
Claim 16
Independent Claim
61 words
A method for identifying a digital object, comprising the steps of: deriving a watermark vector from the digital object; determining an average vector of a selected portion of the digital object; avoiding a dependency between the watermark vector and the digital object by orthogonalizing the watermark vector with respect to the average vector; combining the watermark vector with the digital object.
Claim 17
Independent Claim
61 words
A method for identifying a digital object, comprising the steps of: deriving a watermark vector from the digital object; determining an average vector of a selected portion of the digital object; avoiding a dependency between the watermark vector and the digital object by orthogonalizing the watermark vector with respect to the average vector; combining the watermark vector with the digital object.
Claim 18
Dependent Claim
62 words
The method of claim 13 , wherein the step of deriving a watermark comprises the steps of: generating a message digest by applying a function to the digital object which is preselected to avoid reconstruction of the digital object from the message digest; encrypting the message digest to obtain an encrypted message digest; deriving the watermark vector from the encrypted message digest.
References Cited (Backward Citations)
US4405829A
Cited
WO1989008915A1
Cited
US4939515A
Cited
EP0651554A1
Cited
US5499294A
Cited
US5530751A
Cited
US5606609A
Cited
US5568570A
Cited
US5530759A
Cited
US5613004A
Cited
EP0766468A2
Cited
WO1997013248A1
Cited
US5664018A
Cited
US5949885A
Cited
US5778070A
Cited
US5848155A
Cited
US5765176A
Cited
US5809139A
Cited
US5825892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-08-25 | 2007-02-24 | 2007-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-25 | 2011-02-24 | 2011-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-25 | 2015-02-24 | 2015-08-26 | $7700.00 | Window Closed / Lapsed |