Laser reactive dyes for DVD copy protection system

US6952392B2 · kind B2 · utility

Assignee

• Verification Technologies, Inc. · US

Inventors

• Rakesh Vig · Little Canada, US
• Scott Gerger · Des Moines, US
• Richard Selinfreund · Guilford, US
• Peter Miller · New London, US
• Junzhing Li · New London, US
• Ewell Cook · Middletown, US
• Anthony Saglimbeni · Deep River, US

Key dates

• Filing date: Aug 15, 2003
• Grant date: Oct 4, 2005
• Expiry date: Sep 4, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/266
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method and system for providing copy-protected optical medium using transient optical state change security materials capable of changing optical state when exposed to a wavelength of about 630 nm to about 660 nm and software code to detect such change in optical state.