Apparatus for and method of preventing illicit copying of digital content
US7302575B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 2001 |
| Grant date | Nov 27, 2007 |
| Priority date | — |
| Expiry date | Jul 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00086
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Further increases in the difficulty of importing to a secure domain digital content including watermarks which impose a degree of difficulty on illicit importing to the secure domain of the digital content is disclosed. Further increases in the degree of difficulty are necessary because the degree of difficulty associated with the watermarks is capable of being illicitly overcome by dividing the digital content being imported into segments that are so short that the watermarks cannot be reliably detected. In a recorder, recording is prevented by determining that adjacent activations of start and stop keys are such that the digital content has been so divided. In a playback unit, playback is prevented by determining that recorded sections are so short that the watermarks therein cannot be reliably detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.