JP2010541299A - コンテンツ鍵の変更を支援する方法および装置 - Google Patents
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Abstract
Description
(関連出願の相互参照)
本願は、2007年4月27日に出願された、「コンテンツ鍵の変更の支援(Assisting With Content Key Changes)」という名称の米国特許仮出願第60/914,421号に対する優先権を主張するものであり、参照によりその内容全体が本明細書に組み込まれるものとする。
本明細書では、コンテンツ鍵の変更の支援を提供する方法および装置が開示される。通常、記録されたコンテンツには、I−フレームの位置、プログラムマップテーブル(program map table:「PMT」)の変化など、重要な情報およびイベントに関するデータを格納するDVRインデックスファイルが付随する。一実施形態においては、この後の鍵変更を合図するマーカートークンがインデックスファイルまたは同様のファイルに追加される。新しい鍵を必要とするパケットが復号される前に再生アプリケーションがDRMコンポーネントと通信し、コンテンツ復号鍵を導出して読み込む時間を持てるように、マーカートークンは実際の鍵変更に先立って挿入される。そのため、マーカートークンにより、再生アプリケーションはこの後の鍵変更を見つけ出すことができる。さらに、再生アプリケーションは、トリック再生中に正しい鍵を見つけられるように、マーカートークンをスキャンして、意図された再生位置の前にあるインデックスファイルを検索することができる。リニアコンテンツ再生では、MPEGパケットフォーマットを利用し、奇数/偶数の状態ビットによって鍵変更が明示されるのに対し、コンテンツの異なる部分へのジャンプといったトリック再生に代表されるノンリニア再生では、MPEGパケットフォーマットに依存して鍵変更を行うことができない。単一ビットは、トリックモード使用時にどのCEKが導出されたかを決定するには不十分であり、アプリケーションはコンテンツ再生中にさまざまな場所にジャンプする。一実施形態において、マーカートークン内の情報は、マスタ鍵および示されたルールセットから正しいCEKが生成されるように、コンテンツルールセットのコンテンツライセンスリストを参照するポインタを含む。あるいは、正しいCEKを生成するのにマスタ鍵だけが必要となるように、コンテンツルールセットがマーカートークンに直接含まれていてもよい。このルールセットは、相対的なタイムスタンプ、コピー制御情報(copy control information:「CCI」)ビット、および他の著作権情報を含んでいてもよい。
Claims (9)
- 方法であって、
コンテンツのセットの複数のセグメントと、複数の対応するコンテンツルールセットとを受信すること、
記憶媒体上の前記コンテンツのセットの前記複数のセグメントを記録及び暗号化する1つ以上の命令を提供すること、
ローカルで生成され、セキュリティ保護されており、前記コンテンツのセットと関連付けられているコンテンツライセンスに挿入されるデジタル著作権管理コンポーネントに対して、前記複数のコンテンツルールセットを提供することであって、前記セキュリティ保護されたコンテンツライセンスは、マスタ鍵と、受信の順番に並べられた、受信済みの前記複数の対応するコンテンツルールセットのリストとを含む、前記複数のコンテンツルールセットを提供すること、
前記デジタル著作権管理コンポーネントから複数のマーカートークンを受信することであって、前記複数のマーカートークンの各々は、コンテンツ暗号鍵が前記マスタ鍵および前記コンテンツルールセットから少なくとも部分的に導出されるように、前記マーカートークンと関連付けられているコンテンツのセットのセグメントに対応するコンテンツルールセットを示し、前記コンテンツ暗号鍵は、前記コンテンツルールセットに対応する前記コンテンツのセットの前記セグメントを暗号化および復号するために利用される、前記受信すること、
前記コンテンツのセットの前記複数のセグメントの1つと関連付けられている前記マーカートークンの1つが再生中に見つけ出されるように、前記複数のマーカートークンをデジタルビデオレコーダ・インデックスファイルに挿入すること
を備える方法。 - 前記コンテンツルールセットを示すことは、前記複数の対応するコンテンツルールセットのリストの位置を指すポインタを提供することによって有効となる、請求項1に記載の方法。
- 前記コンテンツルールセットを示すことは、前記マーカートークン内で前記マーカートークンと関連付けられている前記コンテンツのセットの前記セグメントに対応する前記コンテンツルールセットを前記マーカートークン内で提供することによって有効となる、請求項1に記載の方法。
- 前記記憶媒体がハードドライブである、請求項1に記載の方法。
- 前記コンテンツのセットを再生する要求を受信すること、
前記コンテンツの暗号化された最初のセグメントに対応する最初のマーカートークンを前記デジタルビデオレコーダ・インデックスファイルにおいて見つけ出すこと、
前記コンテンツの前記暗号化された最初のセグメントに対応する前記コンテンツ暗号鍵を決定すること、
前記コンテンツの前記暗号化された最初のセグメントを復号する命令を提供すること
をさらに備える、請求項1に記載の方法。 - 前記コンテンツのセットの一部分を再生する要求を受信すること、
前記コンテンツの暗号化されたセグメントに対応する前記マーカートークンを前記デジタルビデオレコーダ・インデックスファイルにおいて見つけ出すこと、
前記コンテンツの前記暗号化されたセグメントに対応する前記コンテンツ暗号鍵を決定すること、
前記コンテンツの前記暗号化されたセグメントを復号する命令を提供すること
をさらに備える、請求項1に記載の方法。 - 前記マーカートークンが、前記暗号化されたセグメントを復号する前記コンテンツ暗号鍵を示す鍵識別子を含む、請求項6に記載の方法。
- 前記コンテンツのパケットヘッダが、前記暗号化されたセグメントを復号する前記コンテンツ暗号鍵の使用時間を示すパリティビットを含む、請求項6に記載の方法。
- 前記コンテンツライセンスが完全でない場合でも、前記コンテンツ暗号鍵が導出される、請求項1に記載の方法。
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US91442107P | 2007-04-27 | 2007-04-27 | |
| US60/914,421 | 2007-04-27 | ||
| US12/108,719 US9171569B2 (en) | 2007-04-27 | 2008-04-24 | Method and apparatus for assisting with content key changes |
| US12/108,719 | 2008-04-24 | ||
| PCT/US2008/061485 WO2008134463A1 (en) | 2007-04-27 | 2008-04-25 | Method and apparatus for assisting with content key changes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2010541299A true JP2010541299A (ja) | 2010-12-24 |
| JP2010541299A5 JP2010541299A5 (ja) | 2013-01-10 |
| JP5399377B2 JP5399377B2 (ja) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010506504A Active JP5399377B2 (ja) | 2007-04-27 | 2008-04-25 | コンテンツ鍵の変更を支援する方法および装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9171569B2 (ja) |
| EP (1) | EP2140451A1 (ja) |
| JP (1) | JP5399377B2 (ja) |
| WO (1) | WO2008134463A1 (ja) |
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| US8667279B2 (en) | 2008-07-01 | 2014-03-04 | Sling Media, Inc. | Systems and methods for securely place shifting media content |
| US8381310B2 (en) * | 2009-08-13 | 2013-02-19 | Sling Media Pvt. Ltd. | Systems, methods, and program applications for selectively restricting the placeshifting of copy protected digital media content |
| KR101547554B1 (ko) * | 2008-11-27 | 2015-08-26 | 삼성전자주식회사 | 디지털 콘텐츠 서비스 제공 방법 및 시스템 |
| EP2273405A1 (en) * | 2009-07-07 | 2011-01-12 | Irdeto Access B.V. | Processing recordable content in a stream |
| US9160974B2 (en) | 2009-08-26 | 2015-10-13 | Sling Media, Inc. | Systems and methods for transcoding and place shifting media content |
| US9084031B2 (en) | 2010-12-13 | 2015-07-14 | Microsoft Technology Licensing, Llc | Content license storage |
| US8751807B2 (en) * | 2011-06-23 | 2014-06-10 | Azuki Systems Inc. | Method and system for secure over-the-top live video delivery |
| WO2014144531A1 (en) * | 2013-03-15 | 2014-09-18 | General Instrument Corporation | Method and apparatus for secure storage and retrieval of live off disk media programs |
| US9223942B2 (en) | 2013-10-31 | 2015-12-29 | Sony Corporation | Automatically presenting rights protected content on previously unauthorized device |
| ES2731789T3 (es) * | 2015-03-20 | 2019-11-19 | Nagravision Sa | Método y dispositivo para proteger un contenido multimedia descifrado antes de su transmisión a un dispositivo de consumo |
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| JP2004521428A (ja) * | 2001-06-08 | 2004-07-15 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 制御ワードを用いて暗号化されたサービスに選択的にアクセスするデバイス及び方法並びにスマートカード |
| JP2004247036A (ja) * | 2003-02-11 | 2004-09-02 | Thomson Licensing Sa | スクランブルデジタルデータを記録する方法、記録媒体及びかかるデータの読み取り方法 |
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| JP2006513591A (ja) * | 2002-06-12 | 2006-04-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 条件付アクセス装置における暗号化されたデータのトリックプレイ |
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| EP1286349A1 (en) | 2001-08-21 | 2003-02-26 | Canal+ Technologies Société Anonyme | File and content management |
| US8472792B2 (en) | 2003-12-08 | 2013-06-25 | Divx, Llc | Multimedia distribution system |
| US8312267B2 (en) * | 2004-07-20 | 2012-11-13 | Time Warner Cable Inc. | Technique for securely communicating programming content |
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2008
- 2008-04-24 US US12/108,719 patent/US9171569B2/en active Active
- 2008-04-25 WO PCT/US2008/061485 patent/WO2008134463A1/en not_active Ceased
- 2008-04-25 EP EP08746835A patent/EP2140451A1/en not_active Ceased
- 2008-04-25 JP JP2010506504A patent/JP5399377B2/ja active Active
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| WO2001015163A1 (en) * | 1999-08-20 | 2001-03-01 | Sony Corporation | Information recording/reproducing device |
| JP2001351324A (ja) * | 2000-04-04 | 2001-12-21 | Sony Corp | 情報記録装置、情報再生装置、情報記録方法、情報再生方法、および情報記録媒体、並びにプログラム提供媒体 |
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| JP2003115832A (ja) * | 2001-10-03 | 2003-04-18 | Nippon Hoso Kyokai <Nhk> | コンテンツ送信装置、コンテンツ受信装置およびコンテンツ送信プログラム、コンテンツ受信プログラム |
| JP2003281086A (ja) * | 2002-03-20 | 2003-10-03 | Seiko Epson Corp | データ転送制御装置、電子機器及びデータ転送制御方法 |
| JP2006513591A (ja) * | 2002-06-12 | 2006-04-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 条件付アクセス装置における暗号化されたデータのトリックプレイ |
| JP2005531238A (ja) * | 2002-06-27 | 2005-10-13 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 条件付きアクセスによるオーディオ/ビデオ/データストリームのトリックプレイ |
| JP2004247036A (ja) * | 2003-02-11 | 2004-09-02 | Thomson Licensing Sa | スクランブルデジタルデータを記録する方法、記録媒体及びかかるデータの読み取り方法 |
| WO2006114762A2 (en) * | 2005-04-26 | 2006-11-02 | Koninklijke Philips Electronics N.V. | A device for and a method of processing an encrypted data stream for trick play |
Also Published As
| Publication number | Publication date |
|---|---|
| US9171569B2 (en) | 2015-10-27 |
| US20080267398A1 (en) | 2008-10-30 |
| WO2008134463A1 (en) | 2008-11-06 |
| JP5399377B2 (ja) | 2014-01-29 |
| EP2140451A1 (en) | 2010-01-06 |
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