Copyright control system
US5818933A · kind A · utility
75Cited by
9References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1996 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Jul 5, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2107
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A copyright control system for performing access control to copyright digital information. The copyright control system is equipped with an encryption/decryption hardware 11 which accepts encrypted copyright digital information from an option hardware 6 or an FDD unit 3 through a sub-data bus 23. The encryption/decryption hardware 11 decrypts the encrypted digital information using a decryption key obtained from a copyright control center for primary utilization of the encrypted digital information and inputted from an CPU 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.