1
David William Kravitz: Payment and transactions in electronic commerce system. Certco, IP Group of Pillsbury Madison & Sutro, February 22, 2000: US06029150 (572 worldwide citation)

A method of payment in an electronic payment system wherein a plurality of customers have accounts with an agent. A customer obtains an authenticated quote from a specific merchant, the quote including a specification of goods and a payment amount for those goods. The customer sends to the agent a s ...


2
David William Kravitz, David Moshe Goldshlag: Hierarchical key management encoding and decoding. Digital Video Express, David G Grossman, June 14, 2005: US06907127 (151 worldwide citation)

The present invention discloses a construction for key management module functionality which provides for secure encoding and decoding of messages which are up to two blocks long. A method for generating an encoded value having a first encoded value part and a second encoded value part from an unenc ...


3
Ernest F Brickell, Frank W Sudia, David William Kravitz, Peter C Freund, Patrick J Angeles: Adaptive multi-step digital signature system and method of operation thereof. CertCo, Steptoe & Johnson, February 2, 1999: US05867578 (128 worldwide citation)

A multi-step digital signature system and method is provided having a distributed root certifying authority 20. Messages received at the root certifying authority 20 are distributed to root certifying authority members 22-30 who attach partial signatures to the message using root key fragments. In t ...


4
Robert Wilhelm Schumann, Richard Whittemore, David Mosche Goldschlag, David William Kravitz, Siu Leong Iu, Guillaume Mercier, Michael Bergeron, Jack Ehrhardt, Richard Vitkus: Digital content distribution system and method. Digital Video Express, David G Grossman, January 9, 2007: US07162642 (128 worldwide citation)

A content distribution system and method which prevents unauthorized access to secured content such as movies and music. The apparatus includes a source, a receiver, an authorized security device such as a conditional access module (CAM) for decrypting authorized content, an output device for output ...


5
David Moshe Goldshlag, David William Kravitz: Manufacturing trusted devices. Digital Video Express, David G Grossman, October 18, 2005: US06957344 (48 worldwide citation)

The present invention discloses a method and apparatus for manufacturing trusted devices. A licensing authority provides keying information to a multitude of manufactures that insert the keying information into trusted devices. The trusted devices generate final private and public keys using the key ...


6
Robert Wilhelm Schumann, Richard Whittemore, David Moshe Goldschlag, David William Kravitz, Siu Leong Iu, Guillaume Mercier, Michael Bergeron, Jack Ehrhardt, Richard Vitkus: Digital content distribution system and method. Dolby Laboratories Licensing Corporation, April 13, 2010: US07698570 (26 worldwide citation)

A content distribution system and method which prevents unauthorized access to secured content such as movies and music. The system includes a source, a receiver, an authorized security device such as a conditional access module (CAM) for decrypting authorized content and an output device for output ...


7
Yair Frankel, David William Kravitz, Charles Thomas Montgomery, Marcel Mordechay Yung: Computer-based method and system for aiding transactions. CertCo, Pillsbury Winthrop Intellectual Property, March 5, 2002: US06353812 (23 worldwide citation)

A method for aiding transactions by providing warranties against various aspects of a transaction which may be hard to assure ahead of time or when high risk is involved in relying on them. The method employs an infrastructure of a computer and communication systems communication with various distri ...


8
Randy Eye, David William Kravitz, David Moshe Goldshlag: Hierarchical key management. Digital Video Express, David G Grossman, December 13, 2005: US06975728 (8 worldwide citation)

The present invention discloses a general-purpose hierarchical key management method and apparatus whose trusted operation, with respect to compromise of keying material, does not depend upon the controlling application. This enables designs that separate secure key management from the application-s ...


9
Yair Frankel, David William Kravitz, Charles Thomas Montgomery, Marcel Mordechay Yung: Computer-based method and system for aiding transactions. CertCo, Pillsbury Winthrop Shaw Pittman, March 11, 2008: US07343346 (3 worldwide citation)

A method for facilitating provision of a warranty relating to a transaction between two parties in a system which includes an infrastructure composed of a plurality of locations each associated with a respective institution which provides services to clients, the method containing the steps of trans ...


10
Yair Frankel, David William Kravitz, Charles Thomas Montgomery, Marcel Mordechay Yung: Computer-based method and system for aiding transactions. Certco, Pillsbury Winthrop Shaw Pittman, November 27, 2012: US08321348 (2 worldwide citation)

A method for providing a warranty relating to a transaction between two parties, each party being a client of at least one respective institution which provides services to the respective party, the method including: transmitting a request for a warranty from one party to the transaction which is a ...



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