Dynamic enabling of functionality in electronic document readers
US7278168B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2002 |
| Grant date | Oct 2, 2007 |
| Priority date | — |
| Expiry date | Apr 9, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/603
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus, including computer program products, implementing and using techniques for digital rights management. An electronic document containing one or more content items is provided along with a set of usage rights. The set of usage rights defines one or more features to be enabled when the electronic document is processed in an electronic document reader. A representation of a set of content items of the electronic document that are invariant to operations of the features in the set of usage rights is generated, and a digital signature authorizing the set of usage rights is provided. An electronic document and an electronic document reader are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.