Machine-readable optical disc with reading-inhibit agent
US6011772A · kind A · utility
103Cited by
19References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1997 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Jul 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc having machine-readable, information-encoding features is provided with a barrier layer secured to the disc. This barrier layer is configured to prevent machine-reading of the features. A reading-inhibit agent, included in the disc and activated by removal of the barrier layer, is operative, once activated, to alter the disc to inhibit reading of the disc. Alternately, the barrier layer can be eliminated, and the reading-inhibit agent can be activated by initial reading of the disc, as for example by exposure to optical radiation associated with reading of the disc, or rotation of the disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.