Digital rights management (DRM) encryption and data-protection for content on a relatively simple device
US7272858B2 · kind B2 · utility
16Cited by
6References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2002 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Oct 14, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2463/062
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A device has a symmetric device key (DK) and a copy of (DK) encrypted according to a public key (PU) of an entity (PU(DK)). The device receives an object from a host computer, at least a portion of which is encrypted according to (DK). The device sends (PU(DK)) to the host computer, and the host computer sends (PU(DK)) to the entity. The entity applies a corresponding private key (PR) to (PU(DK)) to obtain (DK) and sends (DK) to the host computer. The host computer may then encrypt the object according to (DK) and download same to the device, and the device may decrypt the encrypted object based on (DK).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.