System and methods for using offset information on a data storage medium
US6697208B2 · kind B2 · utility
2Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Oct 9, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and methods for providing offset information on a storage medium are provided by writing at least one unalterable mark on the storage medium during a manufacturing formatting process. The unalterable mark(s) are variably offset from a fixed position. The amount of offset represents a first source of unique information. The unalterable mark(s) themselves comprise a second source of information. Both sources of information are combinable and may be utilized in connection with the generation of a unique serial number for the storage medium or for other digital rights management purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.