Apparatus and method for preventing unauthorized use of information recorded on an information recording medium
US6289102A · kind A · utility
98Cited by
11References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1997 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91364
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information recording medium includes a lead-in area and a data recording area. Key information is recorded in the lead-in area. Scrambled data is recorded in the data recording area. The scrambled data is descrambled based on the key information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.