Information recording medium, recording apparatus, information transmission system, and decryption apparatus
US6144743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Feb 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In the invention, an information recording medium records encrypted information, encrypted key information obtained by encrypting key information for decrypting the encrypted information to obtain original information, and non-encrypted condition information used upon decrypting the encrypted information and recorded in the encrypted key information, and the encrypted information from the information recording medium is decrypted inside an IC card using the encrypted key information and condition information. Upon decrypting the encrypted information from the information recording medium, information that requires security protection or copyright protection can be prevented from being illicitly copied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.