The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 2002
Filed:
Feb. 11, 1999
Dipankar Gupta, Sunnyvale, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A document transfer system enabling a consumer to obtain a document from an owner upon payment using a cryptographic protocol involving the consumer, the owner, a document source, such as printer, and a mediator, according to which protocol the consumer requests a document, the owner provides the source with first and third portions of the key and provides the mediator with a fourth portion of the key, which fourth portion can combine with said first portion to generate the complete key, the consumer provides the owner with the payment and the owner provides the source with a second portion of the key which can combine with said first portion to generate the complete key. A printer for use in the above system, the printer comprising a document memory for storing a received encrypted document, a key memory for storing a first cryptographic key portion, a processor for receiving a second cryptographic key portion and combining it with the first key portion to form a complete cryptographic key which is supplied to a decrypting module. The encrypted document is supplied to the decrypting module whereupon the document is decrypted and supplied to the consumer.