Enabling/disabling display data channel access to enable/disable high-bandwidth digital content protection

Patent metadata

Field	Value
Publication number	US-RE47119-E
Application number	US-201615346235-A
Country	US
Kind code	E1
Filing date	Nov 8, 2016
Priority date	Dec 13, 2011
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

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, the switch dynamically switches to a closed position in order to enable the at least one source to authenticate with the input card and 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 switch switches dynamically to an open position in order to disable the at least one source from authenticating with the input card, therefore the output card also does not attempt to authenticate with the at least one sink for security protocol encryption.

First claim

What is claimed is:

1. A system for enabling/disabling Display Data Channel (DDC) access to enable/disable a security protocol, the system comprising:
at least one source; at least one sink; and a switcher device communicatively coupled in-between the at least one source and the at least one sink, the switcher device comprises:
a multiplexer coupled in-between at least one input and output cards and configured to transmit an audiovisual signal from the at least one input card to a first and at least a second output card via a physical connection; wherein the multiplexer is configured to dynamically switch between the first and at least second output card based on a user control signal that activates one of the at least one sinks, wherein each of the output cards is coupled to the at least one sink;
wherein the input card comprises:
an integrated circuit that includes High-Bandwidth Digital Content Protection (HDCP) enabled receiver; and
a switch coupled in-between the HDCP enabled receiver and an Extended Display Identification Data (EDID) memory, wherein the input card is configured to detect the presence of an event signal from at least one user interfaced device,
wherein in response to the detection of the event signal, the switch is configured to dynamically switch to a closed position in order to enable the at least one source configured to perform a first authentication with the input card and the output card configured to perform a second authentication with the at least one sink for security protocol encryption and the input card is configured to permit the transmission of the audiovisual signal from the at least one source to the at least one sink, and
wherein in response to the non-detection of the event signal, the switch is configured to dynamically switch to an open position in order to disable 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 and the input card is configured to permit the transmission of the audiovisual signal from the at least one source to the at least one sink;

wherein the input card is configured to enable the at least one sink from being able to record since the audiovisual signal includes a non-copy protected content.

2. The system of claim 1 , wherein the at least one source and sink are High-Bandwidth Digital Content Protection compliant.

3. The system of claim 1 , wherein the at least one physical connection interconnects to the at least one source, the switcher device, and the at least one sink device.

4. The system of claim 1 , wherein the physical connection comprises an HDMI cable that carries Transition Minimized Differential Signal (TMDS), Digital Display Channel (DDC), and Hot Plug Detect (HPD) signals.

5. The system of claim 1 , wherein the integrated circuit comprises the switch device, HDCP enabled receiver, and EDID memory, wherein the HDCP enabled receiver and EDID memory are in parallel with respect to each other, and wherein the combination of the HDCP enabled receiver and EDID memory are in series with the switch device.

6. The system of claim 5 , wherein the integrated circuit is in parallel with another EDID memory.

7. The system of claim 1 , wherein the switch device comprises a mechanical switch, electrically operated switch, solid state relay, latching relay, reed relay, Single Pole Single Throw (SPST) relay, Single Pole Double Throw (SPDT) relay, Double Pole Single Throw (DPST) relay, and Double Pole Double Throw (DPDT) relay.

8. The system of claim 1 , wherein the switcher device further comprises a processor coupled to a transceiver for bidirectional communication with the at least one user interface device, wherein the processor and transceiver are configured to process and receive the user control signal in response to a user activating the at least one user interface device.

9. The system of claim 8 , wherein the at least one user interface device comprises a graphical user interface (GUI) touch panel, mobile device, tablet, and computer.

10. The system of claim 8 , wherein the at least one user interface device is configured to transmit the user control signal wired or wirelessly.

11. The system of claim 8 , wherein the at least one user interface device further comprises software tools to assist the user in selecting the at least one source.

12. The system of claim 1 , wherein the at least one source comprises a game console, digital versatile disc (DVD) player, cable box, desktop computer, laptop, and blu-ray player.

13. The system of claim 1 , wherein the least one sink comprises a display device, wherein the display device is a television.

14. The system of claim 1 , wherein the input card is configured to disable the at least one sink from being able to record since the audiovisual signal includes copy protected content.

15. The system of claim 1 , wherein the input card is configured to permit the transmission of audiovisual signal from the at least one source to the at least one sink.

16. The system of claim 1 , wherein the second authentication is attempted if the first authentication is successful between the at least one source and the input card.

17. The system of claim 1 , wherein the first and second authentications includes an encryption.

18. A switcher device, comprising:
a multiplexer coupled in-between at least one input and output cards and configured to transmit an audiovisual data signal from the at least one input card to a first and at least a second output card; wherein the multiplexer is configured to dynamically switch between the first and at least second output card based on a user control signal that activates one of at least one sinks; wherein each of the output cards is coupled to the at least one sink; wherein the input card comprises:
an integrated circuit that includes a High-Bandwidth Digital Content Protection (HDCP) enabled receiver; and
a switch coupled in-between the HDCP enabled receiver and an Extended Display identification Data (EDID) memory, wherein the at least one input card is configured to detect the presence of an event signal from the at least one user interface device;
wherein in response to the detection of the event signal, the switch is configured to dynamically switch to a closed position in order to enable the at least one source configured to authenticate with the input card and the output card configured to authenticate with the at least one sink for security protocol encryption and the input card is configured to permit the transmission of the audiovisual signal from the at least one source to the at least one sink, and
wherein in response to the non-detection of the event signal, the switch is configured to dynamically switch to an open position in order to disable the at least one source from initiating an authentication with the input card, therefore the output card also does not attempt to initiate an authentication with the at least one sink for security protocol encryption and the input card is configured to permit the transmission of the audiovisual signal from the at least one source to the at least one sink;

wherein the input card is configured to enable the at least one sink from being able to record since the audiovisual signal includes non-copy protected content.

19. The switcher device of claim 18 , wherein the integrated circuit comprises the switch device, HDCP enabled receiver, and EDID memory, wherein the H

Assignees

• Crestron Electronics Inc

Inventors

• Velasco Adolfo
• Jackson Daniel
• Mao Yun
• Pagano Dario

Classifications

• H04L63/083 Primary

  using passwords (cryptographic mechanisms or cryptographic arrangements for entity authentication using a predetermined code H04L9/3226) · CPC title

• H04L63/105

  Multiple levels of security · CPC title

• H04L63/0853

  using an additional device, e.g. smartcard, SIM or a different communication terminal (cryptographic mechanisms or cryptographic arrangements for entity authentication involving additional secure or trusted devices H04L9/3234) · CPC title

• H04L63/0435

  wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption (cryptographic mechanisms or cryptographic arrangements for symmetric key encryption H04L9/06) · CPC title

• H04L29/06

  Electricity · mapped topic