Copy-protected optical media and method of manufacture thereof
US6838145B2 · kind B2 · utility
15Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2003 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Aug 28, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A computer-readable medium having material at a select position therein and containing instructions for controlling an optical reader to cause the optical reader to re-read the position having the material one or more times to elicit a measurable parameter at such position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.