JP4679093B2 - デジタルコンテンツのためのアクセス制御 - Google Patents
デジタルコンテンツのためのアクセス制御 Download PDFInfo
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Description
Claims (19)
- 1つ以上のコンテンツ鍵の組を用いて、アクセス制御処理を入力データコンテンツに適用し、アクセス制御されたデータコンテンツをコンテンツストレージ媒体に記録する記録システムにおいて、
上記コンテンツ鍵の組に基づいて上記入力データコンテンツの一部を暗号化し、暗号化された入力データコンテンツを生成する暗号化ロジックを有する暗号化装置と、
データコンテンツを記録したユーザ又はユーザグループに関連する秘密鍵/公開鍵の対の秘密鍵を導出可能な情報を安全に保存するアクセス制御メモリ装置とを備え、
上記暗号化装置及びアクセス制御メモリ装置は、協働して、コンテンツアクセス制御データを生成するコンテンツアクセス制御データ生成器を提供し、上記コンテンツアクセス制御データは、上記コンテンツ鍵の組のそれぞれのサブセットの少なくとも1つの暗号化されたバージョンを含み、上記コンテンツアクセス制御データは、コンテンツ記録アクセス制御データとデフォルトアクセス制御データを含み、上記コンテンツ記録アクセス制御データは、上記アクセス制御メモリ装置に保存された情報から導出可能な秘密鍵に対応する公開鍵に基づいて生成され、上記デフォルトコンテンツアクセス制御データは、上記装置又は上記アクセス制御メモリ装置によってデフォルト公開鍵として定義された、それぞれのデフォルト公開鍵/デフォルト秘密鍵の対の1つ以上の公開鍵に基づいて生成され、上 記デフォルトコンテンツアクセス制御データは、上記デフォルト秘密鍵の1つを介して、上記入力データコンテンツに対し、上記データコンテンツを記録するユーザ又はユーザグループのアクセスレベルと同じアクセスレベルを提供し、
上記暗号化装置は、上記暗号化された入力データコンテンツを、上記コンテンツ記録アクセス制御データと上記デフォルトコンテンツアクセス制御データと共に上記コンテンツストレージ媒体に記録することを特徴とする記録システム。 - 上記暗号化ロジックは、1つ以上のコンテンツ鍵の組を用いて、上記データコンテンツの一部に対称的な暗号化を適用することを特徴とする請求項1記載の記録システム。
- 上記コンテンツアクセス制御データ生成器は、コンテンツセッション鍵を用いて、1つ以上のコンテンツ鍵の組の上記少なくとも1つのサブセットを対称的に暗号化し、それぞれの公開鍵/秘密鍵の対の公開鍵を用いて、上記コンテンツセッション鍵を非対称的に暗号化することを特徴とする請求項1記載の記録システム。
- 上記コンテンツアクセス制御データ生成器は、それぞれの公開鍵/秘密鍵の対の公開鍵を用いて、上記1つ以上のコンテンツ鍵の組の上記少なくとも1つのサブセットを非対称的に暗号化することを特徴とする請求項1記載の記録システム。
- 上記暗号化装置は、上記1つ以上のコンテンツ鍵の組を生成するためのロジックを有することを特徴とする請求項1記載の記録システム。
- 上記アクセス制御メモリ装置と上記暗号化装置の少なくとも一方は、複数のアクセス制御メモリ装置のそれぞれに関連する公開鍵を保存するためのメモリを有することを特徴とする請求項1記載の記録システム。
- 上記アクセス制御メモリ装置は、他のアクセス制御メモリ装置に保存されている秘密鍵に関連する公開鍵を格納することを特徴とする請求項1記載の記録システム。
- 上記アクセス制御メモリ装置は、リムーバブルメモリ装置であり、上記暗号化装置は、上記暗号化装置と上記リムーバブルメモリ装置の間の安全なデータ接続を提供するインタフェースを備えることを特徴とする請求項1記載の記録システム。
- 上記暗号化装置は、上記複数のリムーバブルメモリ装置のそれぞれに関連する上記複数の公開鍵を保存するためのメモリを含み、上記リムーバブルメモリ装置 は、該リムーバブルメモリ装置をそれぞれの公開鍵に関連させる識別データを保存することを特徴とする請求項8記載の記録システム。
- 上記リムーバブルメモリ装置は、上記情報コンテンツの暗号化を実行し、及び/又は上記コンテンツアクセス制御データを生成するデータ処理モジュールを備えることを特徴とする請求項8記載の記録システム。
- 上記リムーバブルメモリ装置は、スマートカードであることを特徴とする請求項8記載の記録システム。
- 上記リムーバブルメモリ装置は、マジックゲート(商標)メモリースティック(商標)装置であることを特徴とする請求項8記載の記録システム。
- 上記リムーバブルメモリ装置は、セキュアデジタルカードであることを特徴とする請求項8記載の記録システム。
- 上記暗号化装置は、オーディオ及び/又はビデオ捕捉又は処理装置を備えることを特徴とする請求項1記載の記録システム。
- 上記入力データコンテンツは、ビデオ画像を含み、上記暗号化ロジックは、上記ビデオ画像に対し、対称暗号化、非対称暗号化及び可視ウォータマークの付与のうちの少なくとも1つを適用することを特徴とする請求項1記載の記録システム。
- 1つ以上のコンテンツ鍵の組を用いて、入力データコンテンツにアクセス制御処理を適用し、コンテンツストレージ媒体にアクセス制御されたデータコンテンツを記録する記録システムにおいて、
上記コンテンツ鍵の組に基づいて上記入力データコンテンツの一部を暗号化し、暗号化された入力データコンテンツを生成する暗号化ロジックと、
上記暗号化ロジックと、データコンテンツを記録したユーザ又はユーザグループに関連する秘密鍵/公開鍵の対の秘密鍵を導出可能な情報を安全に保存するアクセス制御メモリ装置との間の安全なデータ接続を提供するインタフェースと、
上記コンテンツ鍵の組のそれぞれのサブセットの少なくとも1つの暗号化されたバージョンと、上記アクセス制御メモリ装置に保存された情報から導出可能な秘密鍵に対応する公開鍵に基づいて生成されるコンテンツ記録アクセス制御データと、上記暗号化ロジック装置又は上記アクセス制御メモリ装置によってデフォルト公開鍵として定義されるそれぞれのデフォルト公開鍵/デフォルト秘密鍵組の1つ以上の公開鍵に基づいて生成され、上記デフォルト秘密鍵の1つを介して、上記入力データコンテンツに対し上記データコンテンツを記録したユーザ又はユーザグループに対するアクセスレベルと同じアクセスレベルを提供するデフォルトコンテンツアクセス制御データとを含むコンテンツアクセス制御データを生成するコンテンツアクセス制御データ生成器とを備え、
上記暗号化ロジックは、上記コンテンツストレージ媒体に上記コンテンツ記録アクセス制御データ及び上記デフォルトコンテンツアクセス制御データと共に上記暗号化された入力データコンテンツを記録することを特徴とする記録システム。 - 暗号化装置とアクセス制御メモリ装置とを備える記録システムにより、1つ以上のコンテンツ鍵の組を用いて、アクセス制御処理を入力データコンテンツに適用し、アクセス制御されたデータコンテンツをコンテンツストレージ媒体に記録する記録方法において、
上記暗号化装置により、上記コンテンツ鍵の組に基づいて上記入力データコンテンツの一部を暗号化し、暗号化された入力データコンテンツを生成するステップと、
上記アクセス制御メモリ装置により、データコンテンツを記録したユーザ又はユーザグループに関連する秘密鍵/公開鍵の対の秘密鍵を導出可能な情報を安全に保存するステップと、
上記暗号化装置及び上記アクセス制御メモリ装置の協働により、上記コンテンツ鍵の組のそれぞれのサブセットの少なくとも1つの暗号化されたバージョンと、上記アクセス制御メモリ装置に保存された情報から導出可能な秘密鍵に対応する公開鍵に基づいて生成されるコンテンツ記録アクセス制御データと、上記暗号化装置又は上記アクセス制御メモリ装置によってデフォルト公開鍵として定義されるそれぞれのデフォルト公開鍵/デフォルト秘密鍵組の1つ以上の公開鍵に基づいて生成され、上記デフォルト秘密鍵の1つを介して、上記入力データコンテンツに対し上記データコンテンツを記録したユーザ又はユーザグループに対するアクセスレベルと同じアクセスレベルを提供するデフォルトコンテンツアクセス制御データとを含むコンテンツアクセス制御データを生成するステップと、
上記暗号化装置により、上記暗号化された入力データコンテンツを、上記コンテンツ記録アクセス制御データと上記デフォルトコンテンツアクセス制御データと共に上記コンテンツストレージ媒体に記録するステップとを有する記録方法。 - コンピュータに、請求項17記載の記録方法における各ステップを実行させるプログラム。
- 請求項18記載のプログラムを記録した記録媒体。
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EP1505595A2 (en) | 2005-02-09 |
GB0317967D0 (en) | 2003-09-03 |
JP2005124149A (ja) | 2005-05-12 |
GB2404489A (en) | 2005-02-02 |
EP1505595A3 (en) | 2010-10-27 |
US7461406B2 (en) | 2008-12-02 |
US20050180573A1 (en) | 2005-08-18 |
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