JP4860149B2 - デジタルコンテンツマーキング方法、デジタルコンテンツ内のフィンガープリントを検出する方法、デジタルコンテンツ、デジタルコンテンツに透かしを入れる装置、透かしを入れたデジタルコンテンツにフィンガープリントをほどこす装置、デジタルコンテンツ内のフィンガープリントを検出する装置、およびインストラクションを含む情報を格納するメモリ - Google Patents
デジタルコンテンツマーキング方法、デジタルコンテンツ内のフィンガープリントを検出する方法、デジタルコンテンツ、デジタルコンテンツに透かしを入れる装置、透かしを入れたデジタルコンテンツにフィンガープリントをほどこす装置、デジタルコンテンツ内のフィンガープリントを検出する装置、およびインストラクションを含む情報を格納するメモリ Download PDFInfo
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Description
次の用語は、以下で説明するように、本発明の態様に関連し、あるいは関係している。これらの用語の一般的な意味の記述は、制限を意図するものではなく、説明を意図しているに過ぎない。
図1は、デジタルコンテンツに透かしを入れ、フィンガープリントをほどこすシステムのブロック図を示している。
注入オリジン120は、ビデオ配布ネットワーク110外部のソースから、メディアストリーム用のデジタルコンテンツ121を受けとる。好適な実施例では、これらのソースは、例えば、映画プロダクションスタジオ、テレビスタジオ、ラジオまたはテレビのネットワークシンジケータなどのような、コンテンツプロデューサーあるいはコンテンツアグリゲータを含んでいてもよい。必要であれば、注入オリジン120は、デジタルコンテンツ121をフォーマットし、それに透かしを入れ、さらに、注入オリジン120での記憶のためにそれを暗号化する。好適な実施例では、注入オリジン120は、本明細書で説明されるように、透かしを入れ、フィンガープリントをほどこす方法を使用する。
ビデオ配布ネットワーク110内の任意の送り主が、任意の受取人に対して、いつデジタルコンテンツ121を配送しても、送り主は、その受取人に対してデジタルコンテンツ121の適応を実行する。適応では、送り主は、そのデジタルコンテンツのコピーを復号化し、そのデジタルコンテンツを部分的にフィンガープリントし、さらにその部分的にフィンガープリントされたデジタルコンテンツを再暗号化することにより、情報を、そのデジタルコンテンツにより表示されるメディアストリーム内に埋め込む。
図2は、本発明に従う、MPEG符号化と、代替ブロック(すなわち、代替ブロック)の生成を示す。本発明は、MPEG符号化デジタルコンテンツでの使用に限定されない。MPEGの文脈での本発明の以下の議論を読んだ後は、デジタル符号化の当業者であるなら、過度の実験あるいはさらなる発明を要することなく、本発明を異なる符号化スキームおよびデータタイプに適用することができるだろう。
これらの位置でのブロック位置および代替ブロックの組は、MPEGの文脈での位置および可能な改変の組の特定の例である。概して、これらの位置でのこうした位置および可能な改変の組は、本発明に従う透かしを形成する。ステップ401およびステップ402は、この透かしの作成ステップである。これらのステップは、注入オリジン120で実行されるのが好ましい。
・ブロックは、イントラ符号化されたマクロブロックの一部分である
・ブロックは、プラスあるいはマイナス1のレベルの値により変化可能な、1つか2つのランレベルコードを含んでいる。ランレベルにおけるその変化は、変化していないレベルに対するVLCと同一の長さを有するVLCをもたらす。(2つのランレベルコードが変化する場合、VLCの長さの合計だけが等しい必要がある)
ブロックの量子化スケールは24以下である。
図4に戻って、フィンガープリンティングはステップ403で実行される。フィンガープリンティングは、情報をデジタルコンテンツに埋め込むために、選択された位置で改変のいくつかを実際に作成する処理である。MPEGの文脈では、改変は、いくつかのオリジナルブロックに代えて代替ブロックを使用することにより作成される。
フィンガープリンティングが重要であるのは、埋め込まれた情報を抽出可能であるからに他ならない。図6は、デジタルコンテンツ内のフィンガープリントから、埋め込まれた情報を抽出する方法のフロー図を示している。データは、図6に示したステップを実行可能な計算装置で抽出可能である。こうした計算装置は、少なくとも、デジタルコンテンツを格納し、さらにステップを実行するインストラクションを格納するプロセッサおよびメモリを含んでいるのが好ましい。
代替ブロックの生成は、デジタルコンテンツに対して使用される符号化のタイプに依存していない。一般的な意味で、本発明の透かし入れ技術およびフィンガープリントをほどこす技術は、連続の、あるいはアナログの物理処理をモデル化する、いかなるディジタルデータにも適用可能である。本発明は、MPEG―ハフマンコード化、あるいは他の完全に異なる符号化スキームを使用しているか否かに関係なく、MPEGの何らかのバージョン―により符号化された、デジタル化された音声データ、測定データ、ビデオデータ、他のマルチメディアデータなどに適用可能である。データを埋め込むために、デジタルコンテンツ内の位置を選択し、さらに、選択された位置へほどこされる可能な改変を選択するために、本発明の技術はこのデジタル化されたデータのいずれにも使用可能であり、その間ずっと、データのパケット化が保存される。
Claims (3)
- データが埋め込まれた符号化デジタルコンテンツ内の一組の符号化ブロックを決定するステップと、
それぞれが前記一組の符号化ブロックのうちの一つの符号化ブロックに関連付けられている、複数の可能な代替ブロックを特定するステップと、
前記複数の可能な代替ブロックから一つの代替ブロックのサブセットを選択し、前記代替ブロックのサブセットに関連付けられた複数の符号化ブロックに代えて、前記代替ブロックのサブセットを前記デジタルコンテンツ内に挿入することによって、前記デジタルコンテンツ内にフィンガープリントを埋め込むステップとを含み、
前記可能な代替ブロックのそれぞれは、関連付けられた符号化ブロックの可変長コード(VLC)の改変であり、関連付けられた符号化ブロック内の第1の可変長コードのビット長を増加させる第1の改変と、前記第1の可変長コードのビット長の増加分と等しい量、関連付けられた符号化ブロック内の第2の可変長コードのビット長を減少させる第2の改変とを含み、
前記可能な代替ブロックのそれぞれは、前記関連づけられた一つの符号化ブロックのビット長と等しいビット長であることを特徴とする、フィンガープリントされたデジタルコンテンツを生成する方法。 - データストリーム内において、前記符号化ブロックを含むオリジナルブロックを、前記代替ブロックを含む代替パケットによって置換するステップ、をさらに含む、請求項1に記載の方法。
- 前記決定ステップでは、パケット化されたデータストリーム内のパケットの境界にまたがるブロックを排除する、請求項1に記載の方法。
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US10/356,322 US7003131B2 (en) | 2002-07-09 | 2003-01-31 | Watermarking and fingerprinting digital content using alternative blocks to embed information |
PCT/US2003/021592 WO2004006168A1 (en) | 2002-07-09 | 2003-07-09 | Watermarking and fingerprinting digital content using alternative blocks to embed information |
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JP2011040389A Division JP2011172232A (ja) | 2002-07-09 | 2011-02-25 | デジタルコンテンツマーキング方法、デジタルコンテンツ内のフィンガープリントを検出する方法、デジタルコンテンツ、デジタルコンテンツに透かしを入れる装置、透かしを入れたデジタルコンテンツにフィンガープリントをほどこす装置、デジタルコンテンツ内のフィンガープリントを検出する装置、およびインストラクションを含む情報を格納するメモリ |
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JP2005533410A5 JP2005533410A5 (ja) | 2006-08-24 |
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JP2011040389A Pending JP2011172232A (ja) | 2002-07-09 | 2011-02-25 | デジタルコンテンツマーキング方法、デジタルコンテンツ内のフィンガープリントを検出する方法、デジタルコンテンツ、デジタルコンテンツに透かしを入れる装置、透かしを入れたデジタルコンテンツにフィンガープリントをほどこす装置、デジタルコンテンツ内のフィンガープリントを検出する装置、およびインストラクションを含む情報を格納するメモリ |
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JP2011040389A Pending JP2011172232A (ja) | 2002-07-09 | 2011-02-25 | デジタルコンテンツマーキング方法、デジタルコンテンツ内のフィンガープリントを検出する方法、デジタルコンテンツ、デジタルコンテンツに透かしを入れる装置、透かしを入れたデジタルコンテンツにフィンガープリントをほどこす装置、デジタルコンテンツ内のフィンガープリントを検出する装置、およびインストラクションを含む情報を格納するメモリ |
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US (4) | US7003131B2 (ja) |
EP (1) | EP1529262B1 (ja) |
JP (2) | JP4860149B2 (ja) |
AU (1) | AU2003259108A1 (ja) |
WO (1) | WO2004006168A1 (ja) |
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US6737957B1 (en) | 2000-02-16 | 2004-05-18 | Verance Corporation | Remote control signaling using audio watermarks |
US6834308B1 (en) | 2000-02-17 | 2004-12-21 | Audible Magic Corporation | Method and apparatus for identifying media content presented on a media playing device |
US7562012B1 (en) * | 2000-11-03 | 2009-07-14 | Audible Magic Corporation | Method and apparatus for creating a unique audio signature |
US7363278B2 (en) * | 2001-04-05 | 2008-04-22 | Audible Magic Corporation | Copyright detection and protection system and method |
US7529659B2 (en) | 2005-09-28 | 2009-05-05 | Audible Magic Corporation | Method and apparatus for identifying an unknown work |
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EP1529262A4 (en) | 2010-12-22 |
US7181044B2 (en) | 2007-02-20 |
US20040008864A1 (en) | 2004-01-15 |
JP2011172232A (ja) | 2011-09-01 |
US20070242862A1 (en) | 2007-10-18 |
US7003131B2 (en) | 2006-02-21 |
EP1529262A1 (en) | 2005-05-11 |
EP1529262B1 (en) | 2012-09-05 |
US20120237078A1 (en) | 2012-09-20 |
US8189854B2 (en) | 2012-05-29 |
JP2005533410A (ja) | 2005-11-04 |
WO2004006168A1 (en) | 2004-01-15 |
AU2003259108A1 (en) | 2004-01-23 |
US20060072786A1 (en) | 2006-04-06 |
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