Video control apparatus and control method for video control apparatus

Patent metadata

Field	Value
Publication number	US-8973024-B2
Application number	US-200913001853-A
Country	US
Kind code	B2
Filing date	Jul 23, 2009
Priority date	Aug 13, 2008
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

Whether or not HDCP authentication is necessary is determined and managed for each device connected to an HDMI port. In selector control, when switching to an HDMI port to which is connected a video signal output apparatus that requires HDCP authentication, DDC access is turned off by setting an HPD signal to Low. Communication is then resumed after a predetermined amount of time has passed by setting the HPD signal to High and thereby turning the DDC access back on. When switching to an HDMI port to which is connected a video signal output apparatus that does not require HDCP authentication, the HPD signal is kept at High, and video and audio data is output without resuming the DDC access.

First claim

The invention claimed is:

1. A control apparatus comprising:
a sending unit that sends a predetermined signal to an external apparatus;
a receiving unit that receives video data;
a memory that stores authentication information, wherein the authentication information is used for decrypting encryption of video data received by the receiving unit; and
a control unit that (a) detects, based on an operation mode of the external apparatus, whether or not the external apparatus needs to obtain the authentication information, if a device type of the external apparatus is a predetermined type, (b) detects that the external apparatus needs to obtain the authentication information independent of the operation mode of the external apparatus, if the device type of the external apparatus is not the predetermined type, (c) performs control for changing a state of the predetermined signal to cause the external apparatus to obtain the authentication information, if the external apparatus needs to obtain the authentication information, and (d) causes a display unit to display video data received by the receiving unit without authenticating, using the authentication information, with the external apparatus, if the external apparatus does not need to obtain the authentication information.

2. The control apparatus according to claim 1 , wherein the control unit performs an authentication process for authenticating, using the authentication information, with the external apparatus, if the external apparatus needs to obtain the authentication information, and the control unit causes the display unit to display video data received by the receiving unit after the authentication process is performed, if the external apparatus needs to obtain the authentication information.

3. The control apparatus according to claim 1 , wherein the predetermined signal is a HPD (Hot Plug Detect) signal.

4. The control apparatus according to claim 1 , wherein the authentication information includes information relating to HDCP (High-bandwidth Digital Content Protection).

5. The control apparatus according to claim 1 , wherein the predetermined type is a recorder.

6. The control apparatus according to claim 1 , wherein the predetermined type is a type that is different from a player.

7. The control apparatus according to claim 1 , wherein the predetermined type is a type that is different from an audio system.

8. The control apparatus according to claim 1 , wherein the control unit detects, based on whether the operation mode of the external apparatus is a mode for transmitting a broadcast content, whether or not the external apparatus needs to obtain the authentication information, if the device type of the external apparatus is the predetermined type.

9. The control apparatus according to claim 1 , wherein the control unit detects that the external apparatus needs to obtain the authentication information, if the operation mode of the external apparatus is a mode for transmitting the broadcast content and the device type of the external apparatus is the predetermined type, and the control unit detects that the external apparatus does not need to obtain the authentication information, if the operation mode of the external apparatus is not the mode for transmitting the broadcast content and the device type of the external apparatus is the predetermined type.

10. A control method comprising:
sending a predetermined signal to an external apparatus;
detecting, based on an operation mode of the external apparatus, whether or not the external apparatus needs to obtain authentication information from a control apparatus, if a device type of the external apparatus is a predetermined type, wherein the authentication information is used for decrypting encryption of video data;
detecting that the external apparatus needs to obtain authentication information from the control apparatus independent of the operation mode of the external apparatus, if the device type of the external apparatus is not the predetermined type;
performing control for changing a state of the predetermined signal to cause the external apparatus to obtain the authentication information if the external apparatus needs to obtain the authentication information; and
causing a display unit to display video data received from the external apparatus without authenticating, using the authentication information, with the external apparatus, if the external apparatus does not need to obtain the authentication information.

11. The control method according to claim 10 , wherein the predetermined type is a recorder.

12. The control method according to claim 10 , wherein the predetermined type is a type that is different from a player.

13. The control method according to claim 10 , wherein the predetermined type is a type that is different from an audio system.

14. The control method according to claim 10 , further comprising
detecting, based on whether the operation mode of the external apparatus is a mode for transmitting a broadcast content, whether or not the external apparatus needs to obtain the authentication information, if the device type of the external apparatus is the predetermined type.

15. The control method according to claim 10 , further comprising
detecting that the external apparatus needs to obtain the authentication information, if the operation mode of the external apparatus is a mode for transmitting the broadcast content and the device type of the external apparatus is the predetermined type; and
detecting that the external apparatus does not need to obtain the authentication information, if the operation mode of the external apparatus is not the mode for transmitting the broadcast content and the device type of the external apparatus is the predetermined type.

16. A non-transitory computer-readable storage medium storing a program executed by a computer, wherein the program causes the computer to perform a method, the method comprising:
sending a predetermined signal to an external apparatus;
detecting, based on an operation mode of the external apparatus, whether or not the external apparatus needs to obtain authentication information from a control apparatus, if a device type of the external apparatus is a predetermined type, wherein the authentication information is used for decrypting encryption of video data;
detecting that the external apparatus needs to obtain authentication information from the control apparatus independent of the operation mode of the external apparatus, if the device type of the external apparatus is not the predetermined type;
performing control for changing a state of the predetermined signal to cause the external apparatus to obtain the authentication information, if the external apparatus needs to obtain the authentication information; and
causing a display unit to display video data received from the external apparatus without authenticating, using the authentication information, with the external apparatus if the external apparatus does not need to obtain the authentication information.

Assignees

• Kikkawa Teruki
• Canon Kk

Inventors

• Kikkawa Teruki

Classifications

• H04N21/43632

  involving a wired protocol, e.g. IEEE 1394 (high-speed IEEE 1394 serial bus H04L12/40052) · CPC title

• G09G2370/12

  Use of DVI or HDMI protocol in interfaces along the display data pipeline · CPC title

• G09G5/006

  Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04) · CPC title

• G09G2370/04

  Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller · CPC title

• H04N21/4627 Primary

  Rights management {associated to the content (security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08)} · CPC title