Unlocking an audiovisual product
US7574117B2 · kind B2 · utility
2Cited by
5References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2004 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Aug 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8227
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Access to an audiovisual product 40 is controlled by requiring a user to enter an access code 80. The audiovisual product 40 comprises cells 420 of data whose playback sequence is controlled by a plurality of sequence instructions 410 each having a predetermined structure location within the audiovisual product. A destination function is applied to the access code 80, in order to calculate a destination structure location. Jumping to the calculated location leads to a sequence instruction (e.g. a PGC—Program Chain) to initiate playback of the audiovisual product (e.g. a DVD-Video product).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.