Memory card and data distribution system using it
US7340055B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 1, 2000 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | May 15, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/1088
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A memory card (110) conducts an authentication process with a server based on data stored in an authentication data hold unit (1400). The memory card (110) extracts a first session key (Ks1) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS3). The memory card (110) generates a second session key (Ks2) through a session key generation unit (1418), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks2) and a key (KPm(1)) unique to the memory card (110) in an encrypted state with the first session key (Ks1). The transaction ID and the second session key (Ks2) stored in the log memory (1460) are used in the redistribution process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.