Enabling/disabling display data channel access to enable/ disable high-bandwidth digital content protection
US8681977B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2012 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Apr 22, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A switcher device comprises a multiplexer coupled in-between at least one input and output cards. The multiplexer detects the presence of an event signal from an activated sink. In response to the detection of the event signal, a processor changes an address of an HDCP receiver from a first address to a second address for enabling the at least one source to authenticate with the input card and enabling the output card to authenticate with the at least one sink for security protocol encryption. In response to the non-detection of the event signal, the processor changes the address of an HDCP receiver from the second address to the first address for disabling the at least one source from initiating a first authentication with the input card, therefore the output card also does not attempt to initiate a second authentication with the at least one sink for security protocol encryption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.