Record and related method for storing encoded information using overt code characteristics to identify covert code characteristics
US6993655B1 · kind B1 · utility
17Cited by
27References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1999 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Dec 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A record and related method is provided for storing encoded information comprising a storage media, first marks on the storage media having a covert code characteristic, with the first marks conveying a covertly marked code and second marks preferably having an overt code characteristic which convey a second overtly marked code useful in decoding the covertly marked code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.