Authenticatable media and method of authenticating
US7355944B2 · kind B2 · utility
5Cited by
17References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | May 27, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One method for playing a disk, comprises illuminating a first portion of the optical article with a first laser to obtain a first optical signal, wherein the first laser has a first wavelength, illuminating a second portion with a second laser to obtain a second optical signal, wherein the second laser has a second wavelength that is different from the first wavelength, and determining if the optical article is authentic by comparing the first optical signal and the second optical signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.