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. 15, 2009
Filed:
Sep. 24, 2004
Randy Langer, Port Orchard, WA (US);
Randy Langer, Port Orchard, WA (US);
Other;
Abstract
A method and system for authorizing client devices to receive secured data streams through the use of digital certificates embedded in the client devices. A freely distributed cryptographically signed group file with an embedded expiration date is associated with each individual digital certificate. A single group file can be associated with more than one digital certificate but each digital certificate is associated with a single group file. The group file contains cryptographic keys that can be used to decrypt a section of the digital certificate revealing a set of client keys. The client keys are then used to encrypt a program key which are then sent back to the client device. When the client device requests a specific data stream or digital content, an issuance timestamp associated with the content is compared to the expiration date in the group file. If the issuance timestamp is after the expiration date, the client device is declined. If the issuance timestamp is before the expiration date, the requested content, encrypted utilizing the program key, is sent to the client device.