JP2013255215A - Distributor and content data transmission reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distributor in which viewing can be continued with a sink device whose connection state is not changed under a prescribed condition when the connection state of one sink device changes and content according to an appropriate output type can be outputted in a newly connected sink device, and to provide a content data transmission reception system including the distributor.SOLUTION: When connection of a sink device 4 is cut and a sink device is connected, an information processing section 75 of a distributor 15 of a content data transmission reception system 12 generates EDID data according to EDID of the sink device. The information processing section 75 determines whether the EDID data is the same as setting EDID data stored in an EDID data storage section 54 or not. When they are the same, it is determined whether key information of the sink device is the same as key information of one of devices before disconnection. When the key information are the same, output of content data to a sink device 3 is continued.

Description

  The present invention relates to a distributor that distributes content data input from a source device to a sink device, and a content data transmission / reception system including the distributor.

  In recent years, it has been common to connect digital devices to each other and transmit / receive digitized content data between the devices. As an example, a source device that distributes content data, a plurality of sink devices that are digitally connected to the source device and acquire the content data, and are interposed between the source device and the plurality of sink devices, There is a content data transmission / reception system including a distributor that outputs simultaneously to a plurality of sink devices.

  As a standard for transmitting the digitized content data, there is HDMI (High-Definition Multimedia Interface). HDMI is an audio visual (AV) home appliance that adds a sound transmission function, a copyright protection function, a color difference transmission function, and the like based on DVI (Digital Visual Interface) which is a connection standard between a personal computer (PC) and a display. Connection standard.

  If HDMI is used, video signals and audio signals can be transferred without compression, so that a dedicated chip such as a decoder, software, or the like is not required. Furthermore, it has an intelligence function that allows connected devices to recognize each other. Moreover, it is a single cable in which a video signal, an audio signal, and a control signal are integrated, and wiring between connected devices can be simplified. And since a control signal etc. can also be sent, cooperation between each connection apparatus is also easy. The corresponding video formats include, for example, 480i (interlace), 480p (progressive), 1080i, 720p, 1080p, and the like, and the audio formats include AAC (Advanced Audio Coding), PCM (Pulse Code Modulation), and AC3 (Audio Code). number 3) and the like. Since compatible video formats and audio formats are different for each AV device, when connecting a source device to a sink device, the sink device sets a compatible video format and audio format, and the source device sets this data. To lead. The source device needs to compare a format that can be output with a format that can be received by the sink device, and output a signal in a suitable format.

In HDMI, TMDS (Transition Minimized Differential Signaling) is used for the physical layer, HDCP (High-bandwidth Digital Content Protection system) is used for signal encryption, and EDID (Extended Display Identification Data) is used for inter-device authentication. System connection uses CEC (Consumer Electronics Control)

  HDCP authenticates the distribution route when content data is distributed, and changes the distribution route, such as whether a new device is connected to the distribution route or whether the connected device is removed. Monitor. When a change in the distribution route is detected, the distribution of the content data is interrupted and the distribution route is re-authenticated.

HDCP consists of three stages of authentication. Only the following first and third authentication processes are performed between the source device and the sink device. On the other hand, all of the first to third authentication processes are performed between the source device and the distributor.
In the first authentication process, it is confirmed whether or not the key information held by the connected neighboring device complies with the standard. In the second authentication process, propagation of key information held by all connected devices and confirmation that the key information does not exist in the Revocation List are performed. In the third authentication process, it is confirmed whether or not the encrypted content is normally decrypted.
In the first authentication stage, content that requires copyright protection cannot be output until the confirmation is completed. Therefore, a video that does not require copyright protection such as a black image or a blue screen image is usually displayed on the sink device. Will be displayed.

  In this transmission / reception system, when two sink devices are connected to one source device via a distributor and a video is normally displayed, the power of one sink device is turned off and then turned on. In such a case, re-authentication is prompted for the source device as described above, and the source device performs re-authentication, so that the black image is also displayed on the other sink device that has been displayed normally. Therefore, there is a problem that the user feels uncomfortable.

As an invention of a distribution device that solves this, there is an invention of Patent Document 1.
In the distributor of Patent Document 1, when the second source device is connected while viewing the content of the first source device with the first sink device, for example, the first sink device is placed in the front seat of the car. Yes, when the second sink device is in the back seat of the car, authentication is performed only between the second source device and the second sink device so that the content can be continuously viewed on the first sink device. This prevents unnecessary black video from being displayed on the first sink device. In other words, when content viewing of the unauthenticated source device and sink device is selected, the corresponding route authentication process is performed at that time to enable viewing.

JP 2011-2111580 A

  In a conventional distribution device such as Patent Document 1, when the same content is output from one source device to a plurality of sink devices, when the connection state of a specific sink device changes, for example, the sink device If the source device is prompted for authentication when the connection is disconnected and a new sink device is connected, an unnecessary black image is displayed even on the sink device whose connection state does not change. If the source device is not prompted for authentication, that is, if the status change of the connected sink device is not transmitted, there may be a sink device that does not output audio or a sink device that does not display video. there's a possibility that. Examples of cases where a sink device that does not output audio occurs include cases where the corresponding audio formats of the two sink devices are different, and cases where the corresponding audio format is different depending on the use scene.

  The present invention has been made in view of such circumstances. When the connection state of one sink device changes, it is possible to continue viewing on the sink device whose connection state has not changed under a certain condition. It is another object of the present invention to provide a distributor that can output content based on an appropriate output type in a newly connected sink device, and a content data transmission / reception system including the distributor.

  The distributor according to the present invention is interposed between a source device and a plurality of sink devices, acquires key information of each sink device, and when authentication is requested by the source device, the key information and the success or failure of the authentication. Content information is input from the source device after the authentication by the source device using the key information and the authentication success / failure information is established, and the input content data. In the distributor that outputs the device information including the output type of each sink device, and corresponds to a plurality of sink devices from the acquired device information, and the source device Information extracting means for extracting device information capable of creating content data that can be transmitted and received between the device and each sink device, and extracted device information When authentication of all sink devices connected by the source device and the stored device information storage means has been established, when any sink device is disconnected and any sink device is connected, Device information determination means for determining whether the device information of the sink device acquired by the device information acquisition means corresponds to the device information stored in the device information storage means; and Key information determination means for determining whether the key information of the sink device is the same as the key information of any sink device for which the authentication has been established when it is determined that the device information is supported Authentication success / failure information when the device information determination unit determines that the device information is not supported, or when the key information determination unit determines that the key information is not the same as the key information. Authentication; and a rewriting means for rewriting the information to be negated.

In the present invention, when one sink device is disconnected and an arbitrary sink device is connected, the device information of the connected sink device corresponds to the device information stored in the device information storage unit, When the key information of the sink device is the same as the key information of any sink device that has been authenticated, re-authentication by the source device is not prompted. Therefore, an unauthenticated video such as an unnecessary black video is not displayed on the sink device that is not disconnected. In addition, the connected sink device can output content based on an appropriate output type.
If it is determined that the device information of the connected sink device does not correspond to the device information stored in the device information storage unit, or the key information of the sink device is one of the sync devices for which authentication has been established. If it is determined that the key information of the device is not the same, the source device is urged to re-authenticate, so that the re-authentication process is executed and the copyright is reliably protected. Furthermore, by updating the device information stored in the device information storage means, it is possible to view content based on appropriate device information in a plurality of sink devices.

  The distributor according to the present invention includes a connection unit that connects a plurality of sink devices, and the key information determination unit disconnects the sink device connected to any one of the connection units, and the connection unit When an arbitrary sink device is connected, it is configured to determine whether the key information of the sink device is the same as the key information of the disconnected sink device To do.

In the present invention, when the sink device connected to any one of the connection units is disconnected and an arbitrary sink device is connected, the device information of the connected sink device is stored in the device information storage means. When the key information of the sink device is the same as the key information of the sink device before disconnection, re-authentication by the source device is not prompted. Therefore, an unauthenticated video such as an unnecessary black video is not displayed on the sink device that is not disconnected. In addition, the connected sink device can output content based on an appropriate output type.
When it is determined that the device information of the connected sink device does not correspond to the device information stored in the device information storage unit, or the key information of the sink device is not the same as the key information of the sink device before disconnection If it is determined, the source device is urged to re-authenticate, so the re-authentication process is executed and the copyright is reliably protected. Furthermore, by updating the device information stored in the device information storage means, it is possible to view content based on appropriate device information in a plurality of sink devices.

  In the distributor according to the present invention, the content data includes video data, and the authentication success / failure information is completely transmitted for each predetermined frame corresponding to the input video data using a ciphertext function common to the source device. Information to be generated in order to make the source device verify, and the rewriting means is for the source device to verify the integrity for each predetermined frame corresponding to video data using the ciphertext function. The authentication success / failure information is rewritten so that the information does not match the information generated at the same time.

  In the present invention, by resetting the value of the authentication success / failure information generated on the distributor side to zero or the like, the source device can easily detect that the authentication has failed and can start the authentication process.

  In the distributor according to the present invention, when it is determined that the device information determination unit does not correspond to the device information, and the authentication success / failure information is rewritten by the rewriting unit, authentication is requested by the source device. In addition, the device information extracting means includes means for storing device information extracted corresponding to the connected sink device and the remaining sink devices in the device information storage means.

  In the present invention, it corresponds to all the sink devices of the sink device that is not disconnected and the newly connected sink device, and the setting is changed to the device information that can be transmitted by the distributor. Since the source device outputs the content data, the content based on the appropriate output format can be viewed on all sink devices.

  The distributor according to the present invention is characterized in that the device information is EDID and includes video format information and audio format information.

  In the present invention, content based on an appropriate video format and audio format can be viewed on a plurality of sink devices.

  A content data transmission / reception system according to the present invention includes any one of the above distributors, a source device that requests authentication from the distributor and outputs content data to the distributor when authentication is established, and the distributor A sink device to which the content data is input.

  In the present invention, when one sink device is disconnected and an arbitrary sink device is connected, the device information of the connected sink device corresponds to the device information stored in the device information storage unit, When the key information is the same as the key information of the sink device before connection, re-authentication by the source device is not prompted. Therefore, an unauthenticated video such as an unnecessary black video is not displayed on the sink device that is not disconnected.

  In the content data transmission / reception system according to the present invention, the sink device includes a display device and a receiving unit that receives a television broadcast, and an image is displayed on the display device based on the television broadcast received by the receiving unit. It is a television receiver that is adapted to display.

  In the present invention, when a television receiver is provided as a sink device, display of an unauthenticated image such as an unnecessary black image is prevented.

  According to the present invention, when the connection state of one sink device changes, the device information of the connected sink device corresponds to the device information stored in the device information storage means, and the key information of the sink device However, when it is the same as the key information of one of the sink devices for which authentication has been established, viewing can be continued on the sink device whose connection state has not changed. In addition, content based on an appropriate output type can be output in a newly connected sink device.

It is a schematic perspective view which shows the content data transmission / reception system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the content data transmission / reception system which concerns on Embodiment 1 of this invention. It is a flowchart which shows the process sequence of the information processing part which concerns on Embodiment 1 of this invention. It is a flowchart which shows the process sequence of the information processing part which concerns on Embodiment 1 of this invention. It is a flowchart which shows the re-authentication process of the information processing part which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the content data transmission / reception system which concerns on Embodiment 2 of this invention. It is a flowchart which shows the process sequence of the information processing part which concerns on Embodiment 2 of this invention. It is a flowchart which shows the process sequence of the information processing part which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the content data transmission / reception system which concerns on Embodiment 3 of this invention. It is a flowchart which shows the process sequence of the information processing part which concerns on Embodiment 3 of this invention. It is a flowchart which shows the process sequence of the information processing part which concerns on Embodiment 3 of this invention.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
Embodiment 1 FIG.
FIG. 1 is a schematic perspective view showing a content data transmission / reception system 1 according to Embodiment 1 of the present invention, and FIG. 2 is a block diagram showing a configuration of the content data transmission / reception system 1.
The content data transmission / reception system 1 includes a source device 2 that distributes content data, a sink device 3 that is digitally connected to the source device 2 and acquires the content data, a sink device 4, and a source device 2 and a sink device 3. A distributor 5 is provided between the sink device 4 and switches between these connections. Examples of the source device of the content data transmission / reception system according to the present invention include a BD (Blu-ray Disc: registered trademark) player, a BD recorder, an STB (Set Top Box), and a game device. Examples of the sink device include a television receiver and a projector.

In content data transmission / reception system 1 of the present embodiment, a case will be described in which source device 2 is a BD recorder and sink devices 3 and 4 are television receivers.
The sink devices 3 and 4 include display modules 33 and 43 including a display panel and a backlight unit, and front and rear cabinets 32 and 42 and rear cabinets 37 and 47 made of synthetic resin that house the display modules 33 and 43, respectively. Stands 31 and 41, and two speakers 38 and 48 provided in the lower part of the front are provided. The display modules 33 and 43 have a horizontally long and substantially rectangular parallelepiped shape as a whole, and are accommodated in the front cabinets 32 and 42 and the rear cabinets 37 and 47 in a vertically placed state.
The sink devices 3 and 4 include tuners (reception units) 34 and 44 that receive broadcast waves from an antenna (not shown), and decoders 35 and 45 that decode encoded broadcast waves.

The distributor 5 includes a third I / F 51, a data input unit 52, an inter-source authentication processing unit 53, an EDID data storage unit 54, an HPD (Hot Plug Detect) control unit 55, a video / audio processing unit 56, an information storage unit 57, and information. Processing unit 58, first data output unit 59, first authentication processing unit 60, first EDID acquisition unit 61, first HPD detection unit 62, second data output unit 63, second authentication processing unit 64, second EDID acquisition unit 65, A second HPD detection unit 66, a first I / F 67, and a second I / F 68 are provided.

  The third I / F 51 is an interface that transmits and receives digital signals between the source device 2 and the distributor 5. The first I / F 67 is an interface for transmitting / receiving digital signals between the sink device 3 and the distributor 5, and the second I / F 68 is an interface for transmitting / receiving digital signals between the sink device 4 and the distributor 5. is there. Examples of these interfaces include an HDMI interface.

The inter-source authentication processing unit 53 detects the HDCP authentication request of the source device 2. When the authentication request is detected, the authentication source information is prepared based on the key information of the sink devices 3 and 4, and the authentication information is ready. Set the data indicating that.
The information processing unit 58 controls the operation of each part of the distributor 5 and grasps the processing state of each part. Specifically, control related to authentication processing, creation of EDID data, setting of EDID data, control of creation of authentication key information, and the like are performed.
The information storage unit 57 stores the EDID data created by the information processing unit 58 and the key information of the sink device.
The EDID data storage unit 54 stores (sets) EDID data created by the information processing unit 58 and stored in the information storage unit 56.
The HPD control unit 55 sets the HPD signal to High or Low. When the EDID data is stored in the EDID data storage unit 54, the information processing unit 58 sets the HPD signal to Low after the HPD control unit 55 sets the EDID data, and then sets the HPD signal to High.

When the authentication described later is established, the data input unit 52 corresponds to the output type of the sink devices 3 and 4 based on the set EDID data, and inputs encrypted content data of the TMDS method from the source device 2. Then, decryption is performed using the key information for which authentication has been established, and the result is output to the video / audio processing unit 56.
The video / audio processing unit 56 performs predetermined processing, and then outputs the processed data to the first data output unit 59 and the second data output unit 63.

The first data output unit 59 and the second data output unit 63 perform encryption using the key information for which the authentication has been established, and the encrypted content data is synchronized with the sink device via the first I / F 67 and the second I / F 68, respectively. Output to 3 and 4.
The first HPD detection unit 62 detects the HPD signal of the sink device 3, and when the rising edge of the HPD signal is detected, the first EDID acquisition unit 61 acquires the EDID of the sink device 3.
When the second HPD detection unit 66 detects the HPD signal of the sink device 4 and detects the rising edge of the HPD signal, the second EDID acquisition unit 65 acquires the EDID of the sink device 4.
The first authentication processing unit 60 transmits an authentication request signal to the sink device 3 to acquire key information of the sink device 3 and performs authentication with the sink device 3.
The second authentication processing unit 64 transmits an authentication request signal to the sink device 4 to acquire the key information of the sink device 4 and performs authentication with the sink device 4.

  In the content data transmission / reception system 1 configured as described above, when the sink devices 3 and 4 are connected to the distributor 5, the information processing unit 58 of the distributor 5 includes the first HPD detection unit 62 and the second HPD detection unit 66. When the HPD signal of the sink devices 3 and 4 detected by the above rises, the EDID of the sink devices 3 and 4 is read by the first EDID acquisition unit 61 and the second EDID acquisition unit 65.

The information processing unit 58 analyzes the read EDID and recognizes video format information and audio format information that can be received by the sink devices 3 and 4.
Then, the information processing unit 58 extracts a format that can be received by the sink devices 3 and 4 and that can be transmitted / received by the distributor 5 and that can be received by the sink devices 3 and 4 among more appropriate formats. EDID data is created and stored in the information storage unit 57. When the EDID data is set in the EDID data storage unit 54, the HPD control unit 55 sets the HPD signal to Low as described above. Then, after setting the EDID data, the HPD signal is set to High. By setting EDID data, for example, when the audio formats of both the sink devices 3 and 4 are AC3, it is possible to listen to audio based on AC3.

When the source device 2 detects the rising edge of the HPD signal, the source device 2 reads the set EDID data and outputs the content data corresponding to the set EDID data to the distributor 5.
Here, the source device 2 starts HDCP processing when copyright protection is required for the content data to be output. That is, an authentication request is transmitted to the distributor 5. The inter-source authentication processing unit 53 receives an authentication request from the source device 2.
The first authentication processing unit 60 and the second authentication processing unit 64 start authentication with the sink devices 3 and 4, and when the authentication with the sink devices 3 and 4 is completed, the first authentication processing unit 60 and the second authentication processing unit 64 The processing unit 64 gives the key information of the sink devices 3 and 4 to the information processing unit 58. The information processing unit 58 collectively provides the key information of the sink devices 3 and 4 to the inter-source authentication processing unit 53.

The inter-source authentication processing unit 53 creates authentication key information based on the key information, and sets data indicating that the authentication information has been prepared. The source device 2 detects the authentication information preparation completion data, acquires the key information of the sink devices 3 and 4, and compares the values calculated based on the key information acquired by the source device 2 and the distributor 5, respectively. To confirm and complete the authentication. As a result, it is possible to transmit and receive content data subjected to encryption processing between devices.
Since the authentication process is performed and data that requires copyright protection cannot be output to the sink devices 3 and 4 until the authentication is established, the sink devices 3 and 4 have black video, blue An in-authentication video that does not require content protection such as a screen is output.
When the authentication is established, as described above, the encrypted content data is input from the source device 2 to the distributor 5, and the content data is output by the distributor 5 to the sink devices 3 and 4. In 4, the video corresponding to the content data is displayed, and the sound is output.

  When the encrypted content data is transmitted and received, when the sink device 4 is disconnected and the second HPD detection unit 66 detects the Low level of the HPD signal, the HPD for the source device 2 is detected. By not performing the control, authentication between the source device 2, the distributor 5, and the sink device 3 is continued, so that the sink device 3 can view video and audio without interruption.

Thereafter, when the sink device 4 'is connected and the second HPD detection unit 66 detects the High level of the HPD signal, the second EDID acquisition unit 65 reads the EDID of the sink device 4'.
The information processing unit 58 recognizes the video format and audio format that can be supported by the sink device 4 ′ from the read EDID. When the sink device 4 ′ is compatible with the video format and audio format of the content data input from the source device 2, that is, when the sink device 4 ′ is compatible with the video format and audio format of the set EDID, to the EDID data storage unit 54. The HDCP authentication process is started without rewriting the set EDID. When the video format and audio format of the read EDID do not correspond to the video format and audio format of the set EDID, a format in which both the sink devices 3 and 4 ′ can receive and the distributor 5 can transmit is used. The described EDID data is created, and the created EDID data is rewritten in the EDID data storage unit 54 as set EDID data.

In the HDCP process, the second authentication processing unit 64 starts authentication with the sink device 4 '. If the key information acquired from the sink device 4 'is the same as the key information at the time of authentication establishment, the authentication process with the sink device 4' is continued, and if the authentication is completed normally, the encrypted content data Is output to the sink device 4 '.
If the key information is different from the key information at the time of authentication establishment, this key information is key information that has not been propagated to the source device 2, and re-authentication from the source device 2 is necessary. In this case, by changing the state of the inter-source authentication processing unit 53 so that the authentication with the source device 2 is not established, the source device 2 detects that the authentication has not been established and performs the re-authentication process. . That is, the inter-source authentication processing unit 53 uses the ciphertext function common to the source device 2 to cause the source device 2 to verify the integrity every predetermined frame (for example, 128 frames) corresponding to the input video data. Information (authentication success / failure information) generated for this purpose does not match the information generated by the source device 2 to verify the integrity for each predetermined frame corresponding to video data using the ciphertext function. The authentication success / failure information is rewritten. Specifically, for example, resetting the value to zero can be mentioned.
The source device 2 detects a mismatch between the information generated by itself and the authentication success / failure information generated by the inter-source authentication processing unit 53, starts a re-authentication process, sends an authentication request to the distributor 5, and performs authentication. Is executed.

3 and 4 are flowcharts showing the processing procedure of the information processing unit 58 described above.
Hereinafter, when authentication is established among the source device 2, the distributor 5, and the sink devices 3 and 4, and content data is output from the source device 2 to the sink devices 3 and 4 via the distributor 5, the distributor A case in which the connection between the sink device 4 and the sink device 4 is disconnected will be described.
The information processing unit 58 recognizes that the sink device 4 'is connected (S1). Here, the sink device connected to the distributor 5 instead of the sink device 4 is referred to as a “sink device 4 ′”. The sink device 4 may be connected again. In this case, the “sink device 4 ′” is the sink device 4.

  The information processing unit 58 determines whether the rising edge of the HPD signal of the sink device 4 ′ detected by the second HPD detection unit 66 has been detected (S2). If it is determined that the rising edge is not detected (S2: NO), the determination process is repeated.

If the information processing unit 58 determines that the rising edge has been detected (S2: YES), the second EDID acquisition unit 65 reads the EDID of the sink device 4 '(S3).
The information processing unit 58 analyzes the EDID and recognizes video format information and audio format information (hereinafter referred to as format information) that can be received by the sink device 4 '(S4).
The information processing unit 58 extracts the format information that can be received by the sink device 4 ′ and that can be transmitted / received by the distributor 5 and can be received by the sink devices 3 and 4 ′, out of the more appropriate format information. EDID data is created and stored in the information storage unit 57 (S5).

The information processing unit 58 determines whether or not the EDID data stored in the information storage unit 57 is the same as the set EDID data stored in the EDID data storage unit 54 (S6).
When it is determined that the information is the same as the set EDID data (S6: YES), the information processing unit 58 sets “EDID Change Flag” to “False” (S7), and when it is determined that the data is not the same as the set EDID data (S6: NO), “EDID Change Flag” is set to “True” (S8).

The information processing unit 58 determines whether or not the sink device 4 ′ is compatible with the received content data (S9).
When the information processing unit 58 determines that the received content data is supported (S9: YES), that is, when it is not necessary to rewrite the set EDID, the information processing unit 58 starts authentication with the sink device 4 '(S10). ).
The information processing unit 58 determines whether or not the key information acquired from the sink device 4 ′ is the same as the key information acquired by the second authentication processing unit 64 when authentication is established (S11).
If the information processing unit 58 determines that the information is the same as the key information (S11: YES), the process proceeds to step S14.

If the information processing unit 58 determines in step S9 that the sink device 4 'does not support the received content data (S9: NO), or if it determines in step S11 that the key information is not the same (S11: NO). ), The authentication success / failure information generated by the inter-source authentication processing unit 53 is rewritten to authentication failure information (S12). As described above, for example, the value is reset to zero.
The source device 2 starts the re-authentication process based on the authentication failure information, and the information processing unit 58 detects the start of the authentication of the source device 2 and performs a process corresponding to the re-authentication of the source device 2 (S13).

FIG. 5 is a flowchart showing this re-authentication process.
The information processing unit 58 determines whether or not the authentication start from the source device 2 is detected (S21). When the information processing unit 58 determines that the start of authentication has not been detected (S21: NO), the determination process is repeated.
When the information processing unit 58 determines that the start of authentication is detected (S21: YES), “EDID
It is determined whether or not “Change Flag” is standing (“True”) (S22).
If the information processing unit 58 determines that “EDID Change Flag” is “False”, the information processing unit 58 performs HDCP processing (S23).
That is, since the sink device 4 ′ corresponds to the received content data (corresponds to the set EDID data) and the key information is different, the information processing unit 58 causes the sink devices 3, 4 ′ by the inter-source authentication processing unit 53. The authentication key information is created based on the key information and data indicating that the authentication information has been prepared is set. The source device 2 detects authentication information preparation completion data, acquires authentication key information, and confirms the content, thereby establishing authentication between the connected devices.

In step S22, when “EDID Change Flag” is “True” (S22), “EDID Change Flag” is set to “False” (S24), and the set EDID data of EDID data storage unit 54 is stored in information storage unit 57. The stored EDID data corresponding to the sinks 3 and 4 'is rewritten (S25). Here, the information processing section 58 sets the EDID data in the EDID data storage section 54 after setting the HPD signal low by the HPD control section 55. After setting, EDID data is set to High.
Then, the information processing unit 58 performs HDCP processing (S26). The information processing unit 58 uses the inter-source authentication processing unit 53 to create authentication key information based on the key information of the sink devices 3 and 4 ′, and sets data indicating that the authentication information has been prepared. The source device 2 detects the authentication information preparation completion data, acquires the authentication key information, and confirms the contents to establish authentication between the connected devices.

In step S14, the information processing unit 58 outputs the content data input from the source device 2 to the sink devices 3 and 4 ′.
The information processing unit 58 determines whether or not the input of content data from the source device 2 has been completed (S15). If the information processing unit 58 determines that the input has not ended (S15: NO), the determination process is repeated.
If the information processing unit 58 determines that the input has been completed (S15: YES), the distribution process ends.

  In the present embodiment, when one sink device 4 is disconnected and an arbitrary sink device 4 ′ is connected, the EDID data of the connected sink device 4 ′ is stored in the EDID data storage unit 54. When it corresponds to the set EDID data and the key information of the sink device 4 ′ is the same as the key information of the sink device 4 before disconnection, re-authentication by the source device 2 is not prompted. Therefore, in the sink device 3 that is not disconnected, an in-authentication image such as an unnecessary black image is not displayed, and output of content data to the sink device 3 is continued. In the connected sink device 4 ', content based on an appropriate output type can be output after the distributor 5 and the sink device 4' are authenticated.

When it is determined that the EDID data of the connected sink device 4 ′ does not correspond to the set EDID data stored in the EDID data storage unit 54, or the key information of the sink device 4 ′ is the sink device 4 before disconnection. If it is determined that the key information is not the same, the source device 2 is urged to re-authenticate, so that the copyright is reliably protected and the set EDID data is updated. The content based on appropriate EDID data can be viewed.
Further, in the present embodiment, by resetting the authentication success / failure information generated by the inter-source authentication processing unit 53, the source device 2 easily detects that the authentication has failed, and performs the re-authentication process. Can start.

Embodiment 2. FIG.
FIG. 6 is a block diagram showing a configuration of content data transmission / reception system 11 according to Embodiment 2 of the present invention. In the figure, the same parts as those in FIG.
The content data transmission / reception system 11 includes a source device 2 that distributes content data, a sink device 3, a sink device 4, a sink device 6, and a source device 2 that are digitally connected to the source device 2 and acquire the content data. , A sink device 3, a sink device 4, and a sink device 6, and a distributor 15 that switches these connections.
The content data transmission / reception system 11 includes a fourth I / F 69 for digitally connecting to the sink device 6 in addition to the third I / F 51, the first I / F 67, and the second I / F 68.

  Further, the content data transmission / reception system 11 includes a third data output unit 70 that outputs content data to the sink device 6, a third authentication processing unit 71 that performs authentication by exchanging key information with the sink device 6, and the sink device 6. A third EDID acquisition unit 72 that acquires the EDID from the first and second HPD detection units 73 that detect the HPD signal of the sink device 6.

7 and 8 are flowcharts showing the processing procedure of the information processing unit 58.
Hereinafter, when authentication is established between the source device 2, the distributor 15, and the sink devices 3, 4, 6 and content data is output from the source device 2 to the sink devices 3, 4, 6 via the distributor 15. Next, a case where the connection between the distributor 15 and the sink device 6 is disconnected will be described.
The information processing unit 58 recognizes that the sink device 6 'is connected (S31). Here, the sink device connected to the distributor 15 instead of the sink device 6 is referred to as a “sink device 6 ′”. The sink device 6 may be connected again. In this case, the “sink device 6 ′” is the sink device 6.

  The information processing unit 58 determines whether the rising edge of the HPD signal of the sink device 6 ′ detected by the third HPD detection unit 73 has been detected (S32). If it is determined that the rising edge is not detected (S32: NO), the determination process is repeated.

If the information processing unit 58 determines that the rising edge has been detected (S32: YES), the third EDID acquisition unit 72 reads the EDID of the sink device 6 '(S33).
The information processing unit 58 analyzes the EDID and recognizes format information that can be received by the sink device 6 '(S34).
The information processing unit 58 extracts format information that can be transmitted to and received from the source device 2, the distributor 15, and the sink devices 3, 4, 6 'from the format information that can be received by the sink device 6'. EDID data is created and stored in the information storage unit 57 (S35).

The information processing unit 58 determines whether or not the EDID data stored in the information storage unit 57 is the same as the set EDID data stored in the EDID data storage unit 54 (S36).
When it is determined that the information is the same as the set EDID data (S36: YES), the information processing unit 58 sets “EDID Change Flag” to “False” (S37), and when it is determined that it is not the same as the set EDID data (S36: NO), “EDID Change Flag” is set to “True” (S38).

The information processing unit 58 determines whether or not the sink device 6 ′ is compatible with the received content data (S39).
If the information processing unit 58 determines that the received content data is supported (S39: YES), that is, if it is not necessary to rewrite the set EDID, the information processing unit 58 starts authentication with the sink device 6 '(S40). ).
The information processing unit 58 determines whether or not the key information acquired from the sink device 6 ′ is the same as the key information acquired by the third authentication processing unit 71 when authentication is established (S41).
If the information processing unit 58 determines that the information is the same as the key information (S41: YES), the process proceeds to step S44.

If the information processing unit 58 determines in step S39 that the sink device 6 'does not support received content data (S39: NO), or if it determines in step S41 that the key information is not the same (S41: NO). ), The authentication success / failure information generated by the inter-source authentication processing unit 53 is rewritten to authentication failure information (S42).
The source device 2 starts re-authentication based on authentication failure information, and the information processing unit 58 detects the start of authentication of the source device 2 and performs processing corresponding to re-authentication of the source device 2 (S43). This re-authentication process is the same as the re-authentication process according to the first embodiment (the flowchart in FIG. 5).
However, in this embodiment, when rewriting the set EDID, the information processing unit 58 rewrites the EDID corresponding to the sink devices 3, 4, 6 '. In the HDCP process, authentication key information is created based on the key information of the sink devices 3, 4, 6 ', and data indicating that the authentication information has been prepared is set. The source device 2 detects the authentication information preparation completion data, acquires the authentication key information, and confirms the contents to establish authentication between the connected devices.

In step S44, the information processing section 58 outputs the content data input from the source device 2 to the sink devices 3, 4, 6 '.
The information processing unit 58 determines whether the input of content data from the source device 2 has been completed (S45). When the information processing unit 58 determines that the input has not ended (S45: NO), the determination process is repeated.
If the information processing unit 58 determines that the input has been completed (S45: YES), the distribution process ends.

  In the present embodiment, when one sink device 6 is disconnected and an arbitrary sink device 6 ′ is connected, the EDID data of the connected sink device 6 ′ is stored in the EDID data storage unit 54. When it corresponds to the set EDID data and the key information of the sink device 6 ′ is the same as the key information of the sink device 6 before disconnection, re-authentication by the source device 2 is not prompted. Therefore, an unauthenticated image such as an unnecessary black image is not displayed on the sink devices 3 and 4 that are not disconnected. In the connected sink device 6 ′, content based on an appropriate output type can be output after the distributor 15 and the sink device 6 ′ are authenticated.

When it is determined that the EDID data of the connected sink device does not correspond to the set EDID data stored in the EDID data storage unit 54, or the key information of the sink device 6 ′ is the key of the sink device 6 before disconnection. If it is determined that the information is not the same, the source device 2 is urged to re-authenticate, so that the copyright is reliably protected and the set EDID data is updated. The content based on appropriate EDID data can be viewed.
In the present embodiment, by resetting the authentication success / failure information generated by the inter-source authentication processing unit 53, the source device 2 easily detects that the authentication has failed and starts the authentication process. can do.

Embodiment 3 FIG.
The content data transmission / reception system 12 according to the third embodiment of the present invention is content data transmission / reception except that the processing of the information processing unit 75 is different from the processing of the information processing unit 58 of the content data transmission / reception system 11 according to the second embodiment. It has the same configuration as the system 11.
FIG. 9 is a block diagram showing the configuration of the content data transmission / reception system 12. In the figure, the same parts as those in FIG.

10 and 11 are flowcharts illustrating the processing procedure of the information processing unit 75.
Hereinafter, the sink devices 3, 4, and 6 are connected to the first I / F 67, the second I / F 68, and the fourth I / F 69 of the distributor 15, respectively, and the source device 2, the distributor 15, and the sink devices 3, 4, and 6 A case will be described in which authentication is established between the source device 2 and the content data is output from the source device 2 to the sink devices 3, 4, 6 via the distributor 15.

  When the connection of the sink device 6 is disconnected and the third HPD detection unit 73 detects the Low level of the HPD signal, the source device 2, the distributor 15, and the sink device 3 are not performed by performing HPD control on the source device 2. , 4 is continued, so that the sink devices 3 and 4 can view video and audio without interruption.

  Next, when the connection of the sink device 4 is disconnected and the second HPD detection unit 66 detects the Low level of the HPD signal, the source device 2, the distributor 15, Since the authentication of the sink device 3 is continued, the sink device 3 can view video and audio without interruption.

Thereafter, when the sink device 4 'is connected via the second I / F 68 and the second HPD detection unit 66 detects the High level of the HPD signal, the second EDID acquisition unit 65 reads the EDID of the sink device 4'.
The information processing unit 75 recognizes the video format and audio format that can be supported by the sink device 4 ′ from the read EDID. When the sink device 4 'does not support the video format and audio format of the content data input from the source device 2, that is, when the sink device 4' does not support the video format and audio format of the set EDID, the sink devices 3 and 4 ' EDID data describing a format in which both can be received and the distributor 15 can transmit is created and stored in the information storage unit 57.

When the video format and audio format of the set EDID are supported, the HDCP authentication process (authentication between the distributor 15 and the sink device 4 ′) is started without rewriting the set EDID in the EDID data storage unit 54. . That is, the second authentication processing unit 64 starts authentication with the sink device 4 ′.
If the key information acquired from the sink device 4 ′ is the same as the key information at the time of the previous authentication establishment, the authentication processing with the sink device 4 ′ is continued, and if the authentication is completed normally, the encryption processing is performed. The content data is output to the sink device 4 ′. During this time, the output of content data to the sink device 3 is continued. Here, the key information at the time of the previous authentication establishment is the key information of the sink device 4 or the key information of the sink device 6.
When the key information is different from the key information at the time of authentication establishment, the same re-authentication process as the re-authentication process according to the second embodiment is performed. That is, HDCP authentication processing (authentication between the source device 2, the distributor 15, and the sink devices 3 and 4 ') is performed.

  When the inter-source authentication processing unit 53 detects the start of authentication from the source device 2 in the newly constructed system, that is, the source device 2, the distributor 15, and the sink device 3, 4 ′, the second EDID acquisition unit 65 reads When the video format and audio format of the selected EDID do not correspond to the video format and audio format of the set EDID, the created EDID data stored in the information storage unit 57 is rewritten to the EDID data storage unit 54 as set EDID data, and HPD control is performed. The unit 55 outputs the High signal of HPD to the source device 2, and performs HDCP authentication processing (authentication between the source device 2-distributor 15-sink devices 3 and 4 ').

10 and 11 are flowcharts illustrating the processing procedure of the information processing unit 75.
The information processing unit 75 recognizes that the sink device 4 'is connected (S51). Here, the sink device connected to the distributor 15 instead of the sink device 4 is referred to as “sink device 4 ′”. Either of the sink devices 4 and 6 may be connected. In this case, the “sink device 4 ′” is the sink device 4 or 6.

  The information processing unit 75 determines whether the rising edge of the HPD signal of the sink device 4 ′ detected by the second HPD detection unit 66 is detected (S52). If it is determined that the rising edge is not detected (S52: NO), the determination process is repeated.

If the information processing unit 75 determines that the rising edge has been detected (S52: YES), the second EDID acquisition unit 65 reads the EDID of the sink device 4 '(S53).
The information processing unit 75 analyzes the EDID and recognizes format information that can be received by the sink device 4 '(S54).
The information processing unit 75 extracts format information that can be transmitted / received to / from the source device 2, the distributor 15, and the sink devices 3 and 4 ′ from the format information that can be received by the sink device 4 ′ to obtain EDID data. Is stored in the information storage unit 57 (S55).

The information processing unit 75 determines whether or not the EDID data stored in the information storage unit 57 is the same as the set EDID data stored in the EDID data storage unit 54 (S56).
When it is determined that the information processing unit 75 is the same as the set EDID data (S56: YES), “EDID Change Flag” is set to “False” (S57), and when it is determined that it is not the same as the set EDID data (S56: NO), “EDID Change Flag” is set to “True” (S58).

The information processing section 75 determines whether or not the sink device 4 ′ is compatible with the received content data (S59).
When it is determined that the information processing unit 75 is compatible with the received content data (S59: YES), that is, when it is not necessary to rewrite the set EDID, authentication is started with the sink device 4 '(S60). ).
The information processing section 75 determines whether or not the key information acquired from the sink device 4 ′ is the same as the key information of any sink device when authentication was established last time (S61).
When it is determined that the key information is the same (S61: YES), the information processing section 75 advances the process to step S64.

If the information processing unit 75 determines in step S59 that the sink device 4 'does not support the received content data (S59: NO), or determines in step S61 that the key information is not the same (S61: NO). ), The authentication success / failure information generated by the inter-source authentication processing unit 53 is rewritten to authentication failure information (S62).
The source device 2 starts re-authentication based on authentication failure information, and the information processing unit 75 detects the start of authentication of the source device 2 and performs processing corresponding to re-authentication of the source device 2 (S63). This re-authentication process is the same as the re-authentication process according to the first embodiment (the flowchart in FIG. 5).
However, in the present embodiment, when rewriting the set EDID, the information processing unit 75 rewrites the EDID corresponding to the sink devices 3 and 4 ′. In the HDCP process, authentication key information is created based on the key information of the sink devices 3 and 4 ', and data indicating that the authentication information has been prepared is set. The source device 2 detects the authentication information preparation completion data, acquires the authentication key information, and confirms the contents to establish authentication between the connected devices.

In step S64, the information processing section 75 outputs the content data input from the source device 2 to the sink devices 3 and 4 ′.
The information processing unit 75 determines whether the input of content data from the source device 2 has been completed (S65). If the information processing unit 75 determines that the input has not ended (S65: NO), the determination process is repeated.
If the information processing unit 75 determines that the input has been completed (S65: YES), the distribution process ends.

  In the present embodiment, when one sink device 4 and 6 is disconnected and an arbitrary sink device 4 ′ is connected, the EDID data of the connected sink device 4 ′ is stored in the EDID data storage unit 54. When the key information of the sink device 4 ′ is the same as the key information of the sink device 4 or 6 before disconnection, re-authentication by the source device 2 is not prompted. Therefore, an unauthenticated video such as an unnecessary black video is not displayed on the sink device 3 that is not disconnected. In the connected sink device 4 ', content based on an appropriate output type can be output after the distributor 15 and the sink device 4' are authenticated.

When it is determined that the EDID data of the connected sink device does not correspond to the set EDID data stored in the EDID data storage unit 54, or the key information of the sink device 4 ′ is the sink device 4 or 6 before disconnection. If it is determined that the key information is not the same, the source device 2 is urged to re-authenticate, so that the copyright is reliably protected and the set EDID data is updated. The content based on appropriate EDID data can be viewed.
Note that the same processing as described above is performed when the sink device 6 ′ is connected to the distributor 15 via the fourth I / F 69.

  As described above, in a distributor having three or more HDMI outputs, a signal obtained by performing encryption processing on at least one sink device from a state in which a signal subjected to encryption processing is transmitted to three or more sink devices. When the sink device is connected afterwards, the sink device is a device connected to one of the terminals, that is, the key information is stored in the information storage unit. If the video format and audio format that match the key information correspond to the video format and audio format of the set EDID, it is not necessary because the source device is not re-authenticated. Black image is not displayed. In other words, once a sink device has been authenticated, an unnecessary black image is displayed not only when the sink device is connected to the same terminal, but also when it is connected to any terminal of the distributor. Will not be done.

Note that the number of source devices and sink devices, the processing procedure of the information processing units 58 and 75, the processing for prompting the source device to re-authenticate, etc. are not limited to those described in the first to third embodiments. Absent.
In other words, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

1, 11, 12 Content data transmission / reception system 2 Source device 3, 4, 6 Sink device 5, 15 Distributor 51, 67, 68, 69 3rd I / F, 1st I / F, 2nd I / F, 4th I / F
52 Data Input Unit 53 Inter-Source Authentication Processing Unit 54 EDID Data Storage Unit (Device Information Storage Unit)
55 HPD control unit 56 Video / audio processing unit 57 Information storage unit 58, 75 Information processing unit (device information extraction unit, device information determination unit, key information determination unit, rewrite unit)
59, 63, 70 First data output unit, second data output unit, third data output unit 60, 64, 71 First authentication processing unit, second authentication processing unit, third authentication processing unit 61, 65, 72 1 EDID acquisition part, 2nd EDID acquisition part, 3rd EDID acquisition part (apparatus information acquisition means)
62, 66, 73 First HPD detection unit, second HPD detection unit, third HPD detection unit

Claims (7)

Authentication success / failure information that is interposed between the source device and the plurality of sink devices, obtains key information of each sink device, and determines the success or failure of the authentication when the source device requests authentication. Distribution to the source device, and after authentication by the source device using the key information and authentication success / failure information is established, content data is input from the source device and the input content data is output to each sink device In the vessel
Device information acquisition means for acquiring device information including the output type of each sink device;
Device information extraction means for extracting device information corresponding to a plurality of sink devices and capable of creating content data that can be transmitted and received between the source device and each sink device from the acquired device information When,
Device information storage means for storing the extracted device information;
When authentication of all sink devices connected by the source device is established, when any sink device is disconnected and an arbitrary sink device is connected, the device information acquisition unit acquires the Device information determination means for determining whether the device information of the sink device corresponds to the device information stored in the device information storage means;
Whether or not the key information of the sink device is the same as the key information of any sink device for which the authentication has been established when it is determined by the device information determination means that the device information is supported Key information determination means for determining
When the device information determination unit determines that the device information is not supported, or when the key information determination unit determines that the device information is not the same as the key information, the authentication success / failure information is rewritten with information for which authentication is denied. A distributor comprising: a rewriting means. Having a connection for connecting multiple sink devices,
When the sink device connected to any one of the connection units is disconnected and an arbitrary sink device is connected to the connection unit, the key information determination unit is connected to the key information of the sink device. The distributor according to claim 1, wherein the distributor is configured to determine whether or not the key information is the same as the key information of the disconnected sink device. The content data includes video data, and the authentication success / failure information causes the source device to verify the integrity for each predetermined frame corresponding to the input video data using a ciphertext function common to the source device. Information to generate for
The rewriting means rewrites the authentication success / failure information using the ciphertext function so that the source device does not coincide with information generated for verifying integrity for each predetermined frame corresponding to video data. The distributor according to claim 1 or 2, characterized by the above-mentioned.   When it is determined that the device information determination unit does not support the device information and the renewal unit rewrites the authentication success / failure information, when the source device requests authentication, the device information extraction unit 4. The apparatus according to claim 1, further comprising means for storing device information extracted in correspondence with the connected sink device and the remaining sink devices in the device information storage means. The distributor described.   The distributor according to any one of claims 1 to 4, wherein the device information is EDID, and includes video format information and audio format information. A distributor according to any one of claims 1 to 5,
A source device that requests authentication to the distributor and outputs content data to the distributor when authentication is established;
A content data transmitting / receiving system comprising: a sink device to which the content data is input from the distributor. The sink device is
A display device;
A receiver for receiving television broadcasts,
7. The content data transmission / reception system according to claim 6, wherein the content data transmission / reception system is a television receiver configured to display an image on the display device based on the television broadcast received by the reception unit.

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