Digital rights management using trusted time
US8239961B2 · kind B2 · utility
3Cited by
7References
22Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 22, 2010 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Oct 22, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S705/901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for monitoring time so that the use of protected content can be controlled includes receiving a trusted time value from a trusted authority external to a client device. When the client is no longer in communication with the trusted authority, the previously-received trusted time value is updated by use of the client's operating system counter so that a calculated trusted time value is derived for content license evaluation purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.