1
Frank Thomson Leighton: Watermarking process resilient to collusion attacks. David H Judson, September 2, 1997: US05664018 (420 worldwide citation)

A watermarking procedure wherein each of a set of copies of the work has a slightly-modified form of a "baseline" watermark that is placed within a critical region of the data. The slight variations in the watermarks, however, are not perceptually visible and do not interfere with the work. If multi ...


2
Powell Robert D, Nitzberg Mark J: Method and system for digital image signatures.. Interactive Home Systems, February 2, 1994: EP0581317-A2 (393 worldwide citation)

A method and system for embedding signatures within visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, the signature persisting through image transforms that include resizing as well as conversion to print or film and back to ...


3
Rabbani Majid Eastman Kodak Co, Melnychuck Paul W Eastman Koda, Axman Michael Stuart Eastman K, Baradar Ali R Eastman Kodak Co: Method and apparatus for the addition and removal of digital watermarks in a hierarchical image storage and retrieval system.. Eastman Kodak Co, May 3, 1995: EP0651554-A1 (340 worldwide citation)

An image processing technique is described in the context of a hierarchical image storage and retrieval system. The method allows for the controlled addition and removal of digital watermarks from selected image components in the hierarchy. The method adds a digital watermark in a selected image res ...


4
Stefik Mark J, Pirolli Peter L T: System for controlling the distribution and use of digital works using digital tickets. Xerox, June 5, 1996: EP0715247-A1 (276 worldwide citation)

A system for controlling the distribution and use of digital works (101) using digital tickets. In the present invention, a "digital ticket" is used to entitle the ticket holder to exercise some usage right (102) with respect to a digital work. Usage rights are used to define how a digital work may ...


5
F Thomson Leighton: Method for protecting content using watermarking. David H Judson, September 7, 1999: US05949885 (268 worldwide citation)

A watermarking procedure wherein each of a set of copies of the work has a slightly-modified form of a "baseline" watermark that is placed within a critical region of the data. The slight variations in the watermarks, however, are not perceptually visible and do not interfere with the work. If multi ...


6
Ynjiun P Wang, Jerome Swartz, Daniel R McGlynn: Record with encoded data. Symbol Technologies, Finnegan Henderson Farabow Garrett & Dunner, November 28, 1995: US05471533 (262 worldwide citation)

A record contains a graphic image and an information area which are interrelated to discourage misuse of the record. The information area can overlay the graphic image and include information encoded in a error-correctable, machine-readable format which allows recovery of the information despite dis ...


7
Thorbjorn Vynne, Frederic Jordan: Embedding a digital signature in a video sequence. Cray Research, Schwegman Lundberg Woessner and Kluth P A, September 28, 1999: US05960081 (258 worldwide citation)

Method and apparatus for watermarking digital video material by embedding a digital signature. One embodiment of the system integrates the embedding procedure into a block-based compression scheme. In one embodiment, a 32-bit digital signature is embedded into the x- and y-coordinates of motion vect ...


8
Ann Ewing Hardy, Norman Hardy, E Dean Tribble: Electronic authority server. Agorics, Steven F Flehr Hohbach Test Albritton & Herbert Caserza, June 6, 2000: US06073242 (248 worldwide citation)

An electronic communication authority server that provides centralized key management, implementation of role-based enterprise policies and workflow and projection of corporate authorities over trusted networks. The authority server includes a key database that associates keys, signatures and indica ...


9
Andrew Longacre Jr: One-dimensional bar code symbology and method of using same. Welch Allyn, Harris Beach & Wilcox, December 26, 1995: US05479515 (247 worldwide citation)

A linear bar code symbology combines delta distance start and stop patterns, a space efficient, bit oriented data character structure, and Reed-Solomon redundancy for error detection and correction. A method of writing the bar code structures onto a character medium and reading the resulting symbols ...


10
Tow Robert F: Method and system for embedding machine readable digital data in grayscale images.. Xerox, July 1, 1992: EP0493091-A1 (245 worldwide citation)

The present invention provides a system and method for unobtrusively embedding machine readable digital data of many different types in grayscale images for a wide variety of different purposes. To accomplish that, digital data is written into such an image by means of a low contrast modulation of t ...



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