Copy-protected optical media and method of manufacture thereof
US6638593B2 · kind B2 · utility
34Cited by
302References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2001 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Jun 12, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for fabricating read-only copy protected optical medium comprising a light-sensitive material at positions capable of altering the data read during copying of the optical medium but permitting read of the underlying data in the reading of the optical medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.