Recording device, and content-data playback system
US9083512B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2013 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Oct 3, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.