JP2020198628A5

JP2020198628A5 -

Info

Publication number: JP2020198628A5
Application number: JP2020137732A
Authority: JP
Filing date: 2020-08-18
Publication date: 2021-07-26
Anticipated expiration: 2038-01-26

Description

実施形態によれば、
第１のチューナ部が、ＣＳデジタル放送の第１の事業体が送出する第１のサービス信号
を受信し、前記第１のサービス信号に含まれる第１のスクランブルコンテンツ、所定の頻
度で送信される暗号化された第１ａキー（Ｋｗ）を含む前記第１の事業体の第１ａ制御情
報（ＥＭＭ）、第１の周期で更新され前記第１の周期よりも短くかつ所定の頻度より小さい第２の周期で送信される暗号化された第２ａキー（Ｋｓ）を含む前記第１の事業体の第２ａ制御情報（ＥＣＭ）を受信すること、
第２のチューナ部が、前記ＣＳデジタル放送の第２の事業体が送出する第２のサービス
信号を受信し、前記第２のサービス信号に含まれる第２のスクランブルコンテンツ、所定
の頻度で送信される暗号化された第１ｂキー（Ｋｗ）を含む前記第１の事業体の第１ｂ制
御情報（ＥＭＭ）、第３の周期で更新され前記第３の周期よりも短くかつ所定の頻度より小さい第４の周期で送信される暗号化された第２ｂキー（Ｋｓ）を含む前記第２の事業体の第２ｂ制御情報（ＥＣＭ）を受信すること、
デスクランブラが、前記第１のチューナ部から出力された前記第１のスクランブルコン
テンツをデスクランブルすること、
前記デスクランブラが、前記第２のチューナ部から出力された前記第２のスクランブルコンテンツをデスクランブルすること、
制御部が、前記デスクランブラから出力される第１のコンテンツおよび第２のコンテン
ツの所定のテーブルをチェックすること、
前記所定のテーブルに含まれているパケットＩＤに基づいて、前記第１ａ制御情報（Ｅ
ＭＭ）、前記第２ａ制御情報（ＥＣＭ）、前記第１ｂ制御情報（ＥＭＭ）、前記第２ｂ制御情報（ＥＣＭ）を取り出すこと、前記第１のチューナ部、前記第２のチューナ部、前記デスクランブラを制御すること、
ＣＡＳモジュールが、前記制御部により制御され、前記第１の事業体の前記第１ａ制御
情報（ＥＭＭ）から、固有の第３キー（Ｋｍ）を用いて前記第１ａキー（Ｋｗ）を取得し、前記第１の事業体の前記第２ａ制御情報（ＥＣＭ）から、取得された前記第１ａキー（Ｋｗ）を用いて、前記デスクランブラに与えるための前記第２ａキー（Ｋｓ）を取得すること、
前記ＣＡＳモジュールが、前記制御部により制御され、前記第２の事業体の前記第１ｂ
制御情報（ＥＭＭ）から、固有の第３キー（Ｋｍ）を用いて前記第１ｂキー（Ｋｗ）を取
得し、前記第２の事業体の前記第２ｂ制御情報（ＥＣＭ）から、取得された前記第１ｂキー（Ｋｗ）を用いて、前記デスクランブラに与えるための前記第２ｂキー（Ｋｓ）を取得
すること、を備え、
さらに前記制御部は、
前記第１の事業体の前記第１ａ制御情報（ＥＭＭ）、前記第１の事業体の前記第２ａ制
御情報（ＥＣＭ）、前記第２の事業体の前記第１ｂ制御情報（ＥＭＭ）、前記第２の事業体の前記第２ｂ制御情報（ＥＣＭ）をバッファに格納し、
前記ＣＳデジタル放送の前記第１の事業体を単位として前記第１ａ制御情報（ＥＭＭ）を受信してから前記第１ａ制御情報（ＥＭＭ）に対応した第１コマンド送信を前記ＣＡＳ
モジュールに対して行う期間として前記第１の周期よりも長い第１の期間として３０秒を
設定し、且つ、前記第１の期間に前記第１ａ制御情報（ＥＭＭ）を最小Ｒａ（１以上の整
数）個処理すべきことを設定し、
前記第１の期間に前記第１のチューナ部により受信し前記バッファに格納した前記第１
の事業体の前記第２ａ制御情報（ＥＣＭ）に対応した第２コマンド送信を前記ＣＡＳモジ
ュールに対して行い、前記第１の期間における当該第２コマンド送信に伴う処理以外の時間に前記バッファに格納した前記第１ａ制御情報（ＥＭＭ）に対応した所定数の
第１コマンド送信を前記ＣＡＳモジュールに対して行う事で前記第１の期間に前記第１ａ
制御情報（ＥＭＭ）を最小Ｒａ（１以上の整数）個処理し、
前記ＣＳデジタル放送の前記第２の事業体を単位として前記第１ｂ制御情報（ＥＭＭ）
を受信してから前記第１ｂ制御情報（ＥＭＭ）に対応した第１コマンド送信を前記ＣＡＳ
モジュールに対して行う期間として前記第３の周期よりも長い第２の期間として３０秒を
設定し、且つ、前記第２の期間に前記第１ｂ制御情報（ＥＭＭ）を最小Ｒｂ（１以上の整
数）個処理すべきことを設定し、
前記第２の期間に前記第２のチューナ部により受信し前記バッファに格納した前記第２
の事業体の前記第２ｂ制御情報（ＥＣＭ）に対応した第２コマンド送信を前記ＣＡＳモジ
ュールに対して行い、前記第２の期間における当該第２コマンド送信に伴う処理以外の時間に前記バッファに格納した前記第１ｂ制御情報（ＥＭＭ）に対応した所定数の
第１コマンド送信を前記ＣＡＳモジュールに対して行う事で前記第２の期間に前記第１ｂ
制御情報（ＥＭＭ）を最小Ｒｂ（１以上の整数）個処理し、
前記第１の周期で更新される前記第２ａキー（Ｋｓ）を取得し前記第１のスクランブル
コンテンツを前記デスクランブラによりデスクランブルして記録し、
前記第３の周期で更新される前記第２ｂキー（Ｋｓ）を取得し前記第２のスクランブル
コンテンツを前記デスクランブラによりデスクランブルして記録し、
前記第１の期間内に受信した前記第１の事業体の前記第１ａ制御情報（ＥＭＭ）が前記バッファ内に既に存在する場合にあとから受信した前記第１ａ制御情報（ＥＭＭ）を破棄し、
前記第２の期間内に受信した前記第２の事業体の前記第１ｂ制御情報（ＥＭＭ）が前記バッファ内に既に存在する場合にあとから受信した前記第１ｂ制御情報（ＥＭＭ）を破棄する、受信方法が提供される。 According to the embodiment
The first tuner unit receives the first service signal transmitted by the first business entity of CS digital broadcasting, and transmits the first scrambled content included in the first service signal at a predetermined frequency. The first a control information (EMM) of the first entity, including the encrypted first a key (Kw), is updated in the first cycle and is shorter than the first cycle and less frequently than the predetermined frequency. Receiving the second a control information (ECM) of the first entity, including the encrypted second a key (Ks) transmitted in the cycle of
The second tuner unit receives the second service signal transmitted by the second business entity of the CS digital broadcasting, and transmits the second scrambled content included in the second service signal at a predetermined frequency. The first b control information (EMM) of the first entity, including the encrypted first b key (Kw), is updated in the third cycle and is shorter than the third cycle and less frequently than the predetermined frequency. Receiving the second b control information (ECM) of the second entity, including the encrypted second b key (Ks) transmitted in a cycle of four.
The descrambler descrambles the first scrambled content output from the first tuner unit.
The descrambler descrambles the second scrambled content output from the second tuner unit.
The control unit checks a predetermined table of the first content and the second content output from the descrambler.
The first a control information (E) is based on the packet ID included in the predetermined table.
MM), the second a control information (ECM), the first b control information (EMM), the second b control information (ECM), the first tuner unit, the second tuner unit, and the descrambler. To control,
The CAS module is controlled by the control unit, and obtains the first a key (Kw) from the first a control information (EMM) of the first business entity using a unique third key (Km). Using the acquired first a key (Kw) from the second a control information (ECM) of the first business entity, the second a key (Ks) to be given to the descrambler is acquired.
The CAS module is controlled by the control unit, and the first b of the second business entity.
The first b key (Kw) is acquired from the control information (EMM) using a unique third key (Km), and the acquired from the second b control information (ECM) of the second business entity. The first b key (Kw) is used to obtain the second b key (Ks) to be given to the descrambler.
Further, the control unit
The first a control information (EMM) of the first business entity, the second a control information (ECM) of the first business entity, the first b control information (EMM) of the second business entity, the first The second b control information (ECM) of the second entity is stored in the buffer, and the second b control information (ECM) is stored in the buffer.
After receiving the first a control information (EMM) in units of the first business entity of the CS digital broadcasting, the CAS sends a first command corresponding to the first a control information (EMM).
As the period to be performed on the module, 30 seconds is set as the first period longer than the first period, and the first a control information (EMM) is set to the minimum Ra (integer of 1 or more) in the first period. ) Set what should be processed individually
The first received by the first tuner unit and stored in the buffer during the first period.
The 2a performs control information a second command transmission corresponding to (ECM) to the CAS module, the buffer during the time of processing other than that caused by transmitting the second command in the first period of the entities By transmitting a predetermined number of first commands corresponding to the first a control information (EMM) stored in the CAS module to the CAS module, the first aa is performed during the first period.
Process the minimum Ra (integer of 1 or more) of control information (EMM),
The 1b control information (EMM) in units of the second business entity of the CS digital broadcasting.
Is received, and then the first command transmission corresponding to the first b control information (EMM) is transmitted to the CAS.
As the period to be performed on the module, 30 seconds is set as the second period longer than the third period, and the first b control information (EMM) is set to the minimum Rb (1 or more) in the second period. Set what should be processed (integer),
The second received by the second tuner unit and stored in the buffer during the second period.
The 2b performs second command transmission corresponding to the control information (ECM) to the CAS module, the buffer during the time of processing other than that caused by transmitting the second command in the second period of the entities By transmitting a predetermined number of first commands corresponding to the first b control information (EMM) stored in the CAS module to the CAS module, the first b is performed during the second period.
Process the minimum R b (integer of 1 or more) of control information (EMM),
The second a key (Ks) updated in the first cycle is acquired, and the first scrambled content is descrambled and recorded by the descrambler.
The second b key (Ks) updated in the third cycle is acquired, and the second scrambled content is descrambled and recorded by the descrambler.
If the first a control information (EMM) of the first business entity received within the first period already exists in the buffer, the first a control information (EMM) received later is discarded.
If the first b control information (EMM) of the second business entity received within the second period already exists in the buffer, the first b control information (EMM) received later is discarded. A receiving method is provided.

Claims

The first tuner unit receives the first service signal transmitted by the first business entity of CS digital broadcasting, and transmits the first scrambled content included in the first service signal at a predetermined frequency. The first a control information (EMM) of the first entity, including the encrypted first a key (Kw), is updated in the first cycle and is shorter than the first cycle and less frequently than the predetermined frequency. Receiving the second a control information (ECM) of the first entity, including the encrypted second a key (Ks) transmitted in the cycle of
The second tuner unit receives the second service signal transmitted by the second business entity of the CS digital broadcasting, and transmits the second scrambled content included in the second service signal at a predetermined frequency. The first b control information (EMM) of the first entity, including the encrypted first b key (Kw), is updated in the third cycle and is shorter than the third cycle and less frequently than the predetermined frequency. Receiving the second b control information (ECM) of the second entity, including the encrypted second b key (Ks) transmitted in a cycle of four.
The descrambler descrambles the first scrambled content output from the first tuner unit.
The descrambler descrambles the second scrambled content output from the second tuner unit.
The control unit checks a predetermined table of the first content and the second content output from the descrambler.
The first a control information (E) is based on the packet ID included in the predetermined table.
MM), the second a control information (ECM), the first b control information (EMM), the second b control information (ECM), the first tuner unit, the second tuner unit, and the descrambler. To control,
The CAS module is controlled by the control unit, and obtains the first a key (Kw) from the first a control information (EMM) of the first business entity using a unique third key (Km). Using the acquired first a key (Kw) from the second a control information (ECM) of the first business entity, the second a key (Ks) to be given to the descrambler is acquired.
The CAS module is controlled by the control unit, and the first b of the second business entity.
The first b key (Kw) is acquired from the control information (EMM) using a unique third key (Km), and the acquired from the second b control information (ECM) of the second business entity. The first b key (Kw) is used to obtain the second b key (Ks) to be given to the descrambler.
Further, the control unit
The first a control information (EMM) of the first business entity, the second a control information (ECM) of the first business entity, the first b control information (EMM) of the second business entity, the first The second b control information (ECM) of the second entity is stored in the buffer, and the second b control information (ECM) is stored in the buffer.
After receiving the first a control information (EMM) in units of the first business entity of the CS digital broadcasting, the CAS sends a first command corresponding to the first a control information (EMM).
As the period to be performed on the module, 30 seconds is set as the first period longer than the first period, and the first a control information (EMM) is set to the minimum Ra (integer of 1 or more) in the first period. ) Set what should be processed individually
The first received by the first tuner unit and stored in the buffer during the first period.
The 2a performs control information a second command transmission corresponding to (ECM) to the CAS module, the buffer during the time of processing other than that caused by transmitting the second command in the first period of the entities By transmitting a predetermined number of first commands corresponding to the first a control information (EMM) stored in the CAS module to the CAS module, the first aa is performed during the first period.
Process the minimum Ra (integer of 1 or more) of control information (EMM),
The 1b control information (EMM) in units of the second business entity of the CS digital broadcasting.
Is received, and then the first command transmission corresponding to the first b control information (EMM) is transmitted to the CAS.
As the period to be performed on the module, 30 seconds is set as the second period longer than the third period, and the first b control information (EMM) is set to the minimum Rb (1 or more) in the second period. Set what should be processed (integer),
The second received by the second tuner unit and stored in the buffer during the second period.
The 2b performs second command transmission corresponding to the control information (ECM) to the CAS module, the buffer during the time of processing other than that caused by transmitting the second command in the second period of the entities By transmitting a predetermined number of first commands corresponding to the first b control information (EMM) stored in the CAS module to the CAS module, the first b is performed during the second period.
Process the minimum R b (integer of 1 or more) of control information (EMM),
The second a key (Ks) updated in the first cycle is acquired, and the first scrambled content is descrambled and recorded by the descrambler.
The second b key (Ks) updated in the third cycle is acquired, and the second scrambled content is descrambled and recorded by the descrambler.
If the first a control information (EMM) of the first business entity received within the first period already exists in the buffer, the first a control information (EMM) received later is discarded.
If the first b control information (EMM) of the second business entity received within the second period already exists in the buffer, the first b control information (EMM) received later is discarded. Receiving method.