Method for protecting data recorded on a partial read-only memory (ROM) medium from unauthorized copying
US5654950A · kind A · utility
19Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1995 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Apr 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for preventing generation of third generation data of an original data recorded on a read-only region of a partial read-only memory (ROM) optical disk includes an operation for copying source data from the partial read-only memory to a read-write medium by first attempting to write check data on a read-write region of the partial ROM optical disk. If the check data cannot be written, the copy operation terminates. If the check data can be written, the source data is overwritten. Then, the source data is copied from the partial ROM optical disk to the read-write medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.