License devolution apparatus
US6999947B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1998 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Nov 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/605
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a license devolution system for devolving the right of using as to contents. The license devolution system makes it possible to copy or distribute contents while contributing to a protection of the copyright for the contents. Contents is encrypted with a first key. The first key and use information are encrypted with a second key consisting of a media ID for identifying a first storage medium in which the first key and the use information are stored. In order to devolve the right of using as to the contents, the contents is transferred to a second storage medium of a destination of devolution in the form of encryption. The first key and the use information are decoded with the media ID of the first storage medium, and further encrypted with the media ID of the second storage medium of the destination of devolution into storage in the second storage medium of the destination of devolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.