Trusted license removal in a content protection system or the like
US8060923B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2004 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Jun 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/605
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital license includes an identification of a removal service that can authorize removing such license. A client selects the license to be removed and the service, constructs a challenge including therein a challenge license identification block (LIB) identifying the license to be removed, and sends the challenge to the service. The service receives the challenge, stores at least a portion of the challenge in a database, constructs a response corresponding to the challenge and including therein a response LIB identifying the license to be removed and an identification of the service, and sends the response to the client. The client receives the response, employs the response LIB from the response to identify the license to be removed, and removes the identified license upon confirming that the identification of the service in the identified license matches the identification of the service in the response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.