JP2006254029A - Hdmi signal processing circuit and method for protecting storage medium of hdmi key information - Google Patents

Hdmi signal processing circuit and method for protecting storage medium of hdmi key information Download PDF

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JP2006254029A
JP2006254029A JP2005066959A JP2005066959A JP2006254029A JP 2006254029 A JP2006254029 A JP 2006254029A JP 2005066959 A JP2005066959 A JP 2005066959A JP 2005066959 A JP2005066959 A JP 2005066959A JP 2006254029 A JP2006254029 A JP 2006254029A
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hdmi
circuit
storage medium
key information
signal
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Japanese (ja)
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Kyoko Nakahata
京子 中畑
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent confidential information from being illegally leaked out to the outside from an HDMI (high definition multimedia interface) signal processing circuit and a storage medium storing key information of HDMI. <P>SOLUTION: A television receiver capable of receiving a digital signal subjected to digital copying prevention processing is provided with a device for protecting an HDMI processing circuit for performing authentication processing and decoding and a storage medium storing key information, a circuit for detecting unauthorized access to the circuit and the storage medium, a circuit for stopping an output of an HDMI signal to a video outputting part, and a display circuit for transmitting and displaying display stop of the HDMI signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ＨＤＭＩを搭載したテレビ受信機に関するものである。   The present invention relates to a television receiver equipped with HDMI.

高品質のデジタルコンテンツの不正コピーを防止するため、ＨＤＣＰ（Ｈｉｇｈ−ｂａｎｄｗｉｄｔｈ Ｄｉｇｉｔａｌ Ｃｏｎｔｅｎｔ Ｐｒｏｔｅｃｔｉｏｎ Ｓｙｓｔｅｍ）により、デジタル信号を送受信する機器間では認証処理が行われ、デジタル信号自体は暗号化されている。これによりデジタルコンテンツの著作権を保護している。   In order to prevent unauthorized copying of high-quality digital content, authentication processing is performed between devices that transmit and receive digital signals by HDCP (High-bandwidth Digital Content Protection System), and the digital signals themselves are encrypted. This protects the copyright of the digital content.

さらに、デジタルコンテンツの不正コピーを防ぐため、コンテンツ自体の保護だけでなく、送受信機器に含まれるデジタル信号処理回路や、鍵情報を記憶する記憶媒体も保護することが義務付けられている。   Furthermore, in order to prevent unauthorized copying of digital content, it is obliged not only to protect the content itself, but also to protect the digital signal processing circuit included in the transmission / reception device and the storage medium storing the key information.

このようにＨＤＣＰで保護されたデジタルコンテンツを、高品質のままディスプレイへ表示することを可能にしたインターフェースがＨＤＭＩ（Ｈｉｇｈ Ｄｅｆｉｎｉｔｉｏｎ Ｍｕｌｔｉｍｅｄｉａ Ｉｎｔｅｒｆａｃｅ）である。   The interface that enables the HDCP-protected digital content to be displayed on the display with high quality is the HDMI (High Definition Multimedia Interface).

ＨＤＭＩを搭載したテレビ受信機では、認証処理に成功した場合は、デジタルコンテンツを受信・表示することができるが、認証処理に失敗した場合は、デジタルコンテンツを受信・表示できなかった旨をユーザーへ告知することが可能である（例えば、特許文献１参照）。
特開２００４−９５１５９号公報 A television receiver equipped with HDMI can receive and display digital content if the authentication process is successful, but if the authentication process fails, it informs the user that the digital content could not be received or displayed. It is possible to notify (for example, refer to Patent Document 1).
JP 2004-95159 A

しかし、従来のＨＤＭＩ搭載受信機では、前述した保護すべきデジタル信号処理回路や、鍵情報を記憶する記憶媒体に対して対策がなされていない問題があった。   However, conventional HDMI-equipped receivers have a problem in which no measures are taken with respect to the digital signal processing circuit to be protected and the storage medium for storing key information.

本発明は、従来のＨＤＭＩ搭載受信機では保護できていなかったデジタル信号処理回路及び、鍵情報を記憶する記憶媒体を保護し、外部へ秘密情報が不正流出することを防ぐことを目的とする。   An object of the present invention is to protect a digital signal processing circuit and a storage medium for storing key information, which could not be protected by a conventional HDMI-equipped receiver, and to prevent unauthorized disclosure of secret information to the outside.

上述した課題を解決するために、本発明に係るテレビ受信機は、認証処理及び復号化を行うＨＤＭＩ処理回路と鍵情報を記憶する記憶媒体とを保護する装置と、前記回路及び前記記憶媒体に対する異常接続を検知する手段と、映像表示部へＨＤＭＩ信号の表示を停止する手段と、ＨＤＭＩ信号の表示停止を伝達表示する表示手段とを備えたものである。   In order to solve the above-described problems, a television receiver according to the present invention protects an HDMI processing circuit that performs authentication processing and decryption and a storage medium that stores key information, the circuit, and the storage medium. Means for detecting an abnormal connection, means for stopping the display of the HDMI signal to the video display unit, and display means for transmitting and displaying the stop of the display of the HDMI signal are provided.

本発明に係るテレビ受信機によれば、ＨＤＭＩ処理回路と鍵情報を記憶する記憶媒体とを保護する装置を備え、異常接続を検出した際にはＨＤＭＩ信号の停止する手段を備えた構成としたから、ＨＤＭＩ処理回路及び鍵情報を記憶する記憶媒体からの秘密情報の不正流出を防ぐことができる効果がある。   The television receiver according to the present invention includes a device that protects the HDMI processing circuit and a storage medium that stores key information, and includes a means for stopping the HDMI signal when an abnormal connection is detected. Therefore, there is an effect that it is possible to prevent illegal leakage of secret information from the HDMI processing circuit and the storage medium storing the key information.

また、ＨＤＭＩ信号の表示停止を伝達表示する手段を備えた構成としたから、ＨＤＭＩ信号がディスプレイに表示されなくなった場合にも、ユーザーは原因をつきとめ対処することができる効果がある。   In addition, since the configuration is provided with means for transmitting and displaying the stop of the display of the HDMI signal, even when the HDMI signal is not displayed on the display, there is an effect that the user can find out the cause and deal with it.

（実施の形態１）
図１は、本発明の実施の形態１によるテレビ受信機の構成を示すブロック図である。テレビ受信機１００は、受信部１０１と、ＨＤＭＩ制御部１０２と、ＨＤＭＩ処理部１０３と、記憶部１０４と、保護装置１０５と、ＯＳＤ生成部１０６と、映像表示部１０７とから構成され、受信部１０１を介してデジタル信号を受信し、ＨＤＭＩ制御部１０２の判断によって受信した信号の復号化を行い、映像表示部１０７へ復号された信号の出力を行う。 (Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a television receiver according to Embodiment 1 of the present invention. The television receiver 100 includes a reception unit 101, an HDMI control unit 102, an HDMI processing unit 103, a storage unit 104, a protection device 105, an OSD generation unit 106, and a video display unit 107. The reception unit The digital signal is received via 101, the received signal is decoded according to the judgment of the HDMI control unit 102, and the decoded signal is output to the video display unit 107.

本実施の形態１では、ＨＤＭＩ制御部１０２及び保護装置１０５が請求項に記載された検知する手段に相当し、同様に、ＨＤＭＩ制御部１０２及び映像表示部１０７が停止手段、ＨＤＭＩ制御部１０２、ＯＳＤ生成部１０６及び映像表示部１０７が表示手段に相当する。   In the first embodiment, the HDMI control unit 102 and the protection device 105 correspond to the detection means described in the claims. Similarly, the HDMI control unit 102 and the video display unit 107 are the stop unit, the HDMI control unit 102, The OSD generation unit 106 and the video display unit 107 correspond to display means.

図２は、本発明の実施の形態１に係るＨＤＭＩ信号の出力方法を示したフローチャートである。   FIG. 2 is a flowchart showing an HDMI signal output method according to Embodiment 1 of the present invention.

保護装置１０５は、ＨＤＭＩ処理部１０３及び記憶部１０４との接続状況に応じた接続信号を発信する（Ｓ２１０）。そして、ＨＤＭＩ制御部１０２は、接続信号を受信して異常接続の有無を判断する（Ｓ２２０）。接続信号は保護装置１０５とＨＤＭＩ処理部１０３及び記憶部１０４とを異常接続の有無を判断するための信号である。   The protection device 105 transmits a connection signal corresponding to the connection status with the HDMI processing unit 103 and the storage unit 104 (S210). The HDMI control unit 102 receives the connection signal and determines whether there is an abnormal connection (S220). The connection signal is a signal for determining whether there is an abnormal connection between the protection device 105, the HDMI processing unit 103, and the storage unit 104.

ステップＳ２２０において、ＨＤＭＩ処理部１０３または記憶部１０４に異常接続がないと判断されれば、ＨＤＭＩ制御部１０２は、記憶部１０４より鍵情報を読み出し、ＨＤＭＩ処理部１０３へ鍵情報を転送する（Ｓ２３０）。そして、ＨＤＭＩ制御部１０２は、鍵情報を用いて受信された信号を復号するようＨＤＭＩ処理部１０３を制御する（Ｓ２４０）。映像表示部１０７は復号された信号をディスプレイへ出力する。（Ｓ２５０）
一方、ステップＳ２２０において、ＨＤＭＩ処理部１０３または記憶部１０４に異常接続があったと判断されれば、ＨＤＭＩ制御部１０２は、ＯＳＤ処理部１０６を制御し、表示停止メッセージを生成した後、生成されたメッセージを映像表示部１０７はディスプレイへ出力する（Ｓ２６０）。 If it is determined in step S220 that there is no abnormal connection in the HDMI processing unit 103 or the storage unit 104, the HDMI control unit 102 reads the key information from the storage unit 104 and transfers the key information to the HDMI processing unit 103 (S230). ). Then, the HDMI control unit 102 controls the HDMI processing unit 103 to decrypt the received signal using the key information (S240). The video display unit 107 outputs the decoded signal to the display. (S250)
On the other hand, if it is determined in step S220 that there is an abnormal connection in the HDMI processing unit 103 or the storage unit 104, the HDMI control unit 102 controls the OSD processing unit 106, generates a display stop message, and then generates the display stop message. The video display unit 107 outputs the message to the display (S260).

本発明のＨＤＭＩ信号処理回路及びＨＤＭＩ鍵情報の記憶媒体を保護する方法は、秘密情報の不正流出を防ぐことができる効果を有しており、そのためにＨＤＭＩを搭載したテレビ受信機等の用途にも適用できる。   The method for protecting the HDMI signal processing circuit and the HDMI key information storage medium according to the present invention has an effect of preventing unauthorized leakage of secret information. For this reason, the HDMI signal processing circuit and the HDMI key information storage medium can be used for television receivers and the like equipped with HDMI. Is also applicable.

本発明の実施の形態１におけるテレビ受信機の構成を示すブロック図1 is a block diagram showing a configuration of a television receiver in Embodiment 1 of the present invention. 本発明の実施の形態１におけるＨＤＭＩ信号の出力方法のフローチャートFlowchart of HDMI signal output method in Embodiment 1 of the present invention

符号の説明Explanation of symbols

１０１ 接続部
１０２ ＨＤＭＩ制御部
１０３ ＨＤＭＩ処理部
１０４ 記憶部
１０５ 保護装置
１０６ ＯＳＤ生成部
１０７ 映像出力部 DESCRIPTION OF SYMBOLS 101 Connection part 102 HDMI control part 103 HDMI process part 104 Memory | storage part 105 Protection apparatus 106 OSD production | generation part 107 Image | video output part

Claims (2)

デジタルコピー防止処置が施されたデジタル信号を受信することができるテレビ受信機において、認証処理及び復号化を行うＨＤＭＩ処理回路と鍵情報を記憶する記憶媒体とを保護する装置と、前記回路及び前記記憶媒体に対する不正なアクセスを検知する回路と、映像出力部へＨＤＭＩ信号の出力を停止する回路と、ＨＤＭＩ信号の表示停止を伝達表示する表示回路とを備えたことを特徴とするテレビ受信機。 In a television receiver capable of receiving a digital signal subjected to digital copy prevention measures, an apparatus for protecting an HDMI processing circuit that performs authentication processing and decryption and a storage medium that stores key information, the circuit, and the circuit A television receiver comprising: a circuit for detecting unauthorized access to a storage medium; a circuit for stopping output of an HDMI signal to a video output unit; and a display circuit for transmitting and displaying a display stop of an HDMI signal. デジタルコピー防止処置が施されたデジタル信号を受信することができるテレビ受信機において、認証処理及び復号化を行うＨＤＭＩ処理回路と鍵情報を記憶する記憶媒体とを保護する手段と、前記回路及び前記記憶媒体に対する不正なアクセスを検知する手段と、映像出力部へＨＤＭＩ信号の出力を停止する手段と、ＨＤＭＩ信号の表示停止を伝達表示する表示手段とを備えたことを特徴とするテレビ受信機。 In a television receiver capable of receiving a digital signal subjected to digital copy prevention measures, means for protecting an HDMI processing circuit that performs authentication processing and decryption and a storage medium that stores key information, the circuit, and the circuit A television receiver comprising: means for detecting unauthorized access to a storage medium; means for stopping output of an HDMI signal to a video output unit; and display means for transmitting and displaying a display stop of an HDMI signal.
JP2005066959A 2005-03-10 2005-03-10 Hdmi signal processing circuit and method for protecting storage medium of hdmi key information Pending JP2006254029A (en)

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