Recording medium, recording method and recording apparatus incorporating anti-tamper features involving writing billing information into a write-once area
US6496807B1 · kind B1 · utility
48Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1999 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Sep 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/218
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording medium such as an optical disk has a write-once recording area in which information can be recorded once and cannot be rewritten. The write-once recording area is provided with a billing information recording area in which billing information is sequentially recorded a single time. With this arrangement, it is possible to effectively prevent the unauthorized use of the medium when carrying out off-line billing processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.