Data coypright management method
US5646999A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Oct 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91364
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a process for managing data copyright in the case when a primary user produces new data by editing a plurality of original data and supplies the new data to a secondary user. A public-key and a private-key of the primary user, and a first secret-key and a second secret-key of the original data, each of which is controlled by a copyright management center, and an edit program are used. The primary user, who is supplied a plurality of original data encrypted by each first secret-key thereof, decrypts the plurality of original data by each of the secret-keys and produces new data using the edit program. The primary user re-encrypts the new data by the second secret-key of each original data, respectively. The re-encrypted data is supplied to the secondary-user, together with editing process data which includes a digital signature generated using the private-key. The secondary user presents the editing process data with the digital signature to a copyright management center. The copyright management center confirms that the digital signature is of the primary user, and then, transmits the second secret-key for the respective original data. In the present …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.