Dynamically shifting control word
US7397918B2 · kind B2 · utility
3Cited by
13References
72Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2001 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Sep 8, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4781
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for generating a plurality of control words, each control word controlling access to an object. The method includes providing a control word packet (CWP), generating a first control word (CW) from the CWP, providing a second CW generation input and producing a second CW based, at least in part, on both of the following the first CW and the second CW generation input. Control word generating apparatus for generating a plurality of control words is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.