Reproduction apparatus and decoding apparatus
US6882728B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91364
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Information or contents cannot be reproduced even from a regular storage medium which is encrypted in accordance with a predetermined encryption system, due to erroneous detection of watermarks.Detection of the watermarks and restriction over reproduction depending thereon is conducted only in a case where the medium is not encrypted. In case of detecting that the data is not encrypted in accordance with a predetermined encryption system by an encryption detection circuit (10) and when the watermarks are detected by a watermark detection circuit (20), reproduction of the data is stopped by a reproduction restricting circuit (30). In a case that it is detected to be encrypted in the predetermined encryption system by the encryption detection circuit (10), the reproduction restricting circuit (30) will not stop the reproduction thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.