Optical disk copy-protection using an optically changeable security material
US7035200B2 · kind B2 · utility
4Cited by
13References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2003 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | May 15, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for providing copy-protected optical medium using a substrate having information stored thereon in information pits and information lands, wherein the information lands comprise lands in two different planes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.