JP6078574B2 - 基本ビットストリーム暗号材料伝送システムおよび方法 - Google Patents
基本ビットストリーム暗号材料伝送システムおよび方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
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- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
- H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
- H04N21/2351—Processing of additional data, e.g. scrambling of additional data or processing content descriptors involving encryption of additional data
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- H—ELECTRICITY
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- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/23614—Multiplexing of additional data and video streams
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- H—ELECTRICITY
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- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4348—Demultiplexing of additional data and video streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
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- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
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- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
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- Computer Hardware Design (AREA)
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- General Engineering & Computer Science (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Description
本明細書は、例えば、以下の項目も提供する。
(項目1)
再生デバイス上で暗号化されたビデオを再生する方法であって、少なくとも部分的に暗号化されたビデオデータが、コンテナファイル内に含まれ、前記少なくとも部分的に暗号化されたビデオデータは、暗号情報を使用して、基本ビットストリームを作成するために使用されることができ、前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータを復号するために使用することができ、前記方法は、
前記暗号情報を取得することと、
前記コンテナファイルから、前記少なくとも部分的に暗号化されたビデオデータを抽出し、基本ビットストリームを作成することと、
前記暗号情報を符号化することと、
前記暗号情報を前記基本ビットストリーム内に挿入することと、
前記基本ビットストリームをビデオデコーダに提供することと、
前記ビデオデコーダにおいて、前記基本ビットストリームから前記暗号情報を抽出することと、
前記暗号情報を解読することと、
前記暗号情報を用いて前記基本ビットストリームを復号することと、
前記ビデオデコーダを使用して、ディスプレイデバイス上にレンダリングするために、前記基本ビットストリームをデコードすることと
を含む、方法。
(項目2)
前記暗号情報は、前記コンテナファイルから取得される、項目1に記載の方法。
(項目3)
前記暗号情報は、キー情報と、前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部に関する情報とを含み、前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部は、前記キー情報を使用して暗号化される、項目1に記載の方法。
(項目4)
前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部に関する情報は、前記キー情報を使用して暗号化された、ビデオのエンコードされたフレーム内の暗号化されたデータのブロックの参照である、項目3に記載の方法。
(項目5)
前記基本ビットストリーム内に挿入される前記暗号情報は、識別子によって区切られ、前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータが、前記キー情報を使用して暗号化される前に挿入される、項目4に記載の方法。
(項目6)
前記暗号情報は、前記識別子を使用して抽出される、項目5に記載の方法。
(項目7)
前記復号プロセスは、ビデオデータの暗号化された部分を識別するために、前記キー情報を使用することと、前記キー情報を使用して、前記暗号化されたビデオデータを復号することとによって行われる、項目6に記載の方法。
(項目8)
前記基本ビットストリーム内の異なる場所に挿入される暗号情報は、異なるキー情報を含む、項目7に記載の方法。
(項目9)
前記少なくとも部分的に暗号化されたビデオデータは、エンコードされたビデオのフレームを含み、複数の前記エンコードされたフレームの少なくとも一部は、暗号化される、項目1に記載の方法。
(項目10)
前記符号化プロセスと前記解読プロセスとは、符号化と解読との間の所定の時間を超過した遅延が、前記暗号情報を回復不能にするように、同期される、項目1に記載の方法。
(項目11)
前記符号化プロセスは、データをスクランブルするために、スクランブル化プロセスのシーケンスを使用することによって、データを符号化する、項目10に記載の方法。
(項目12)
前記解読プロセスは、データをスクランブルするために使用されたシーケンスに対して、スクランブル化プロセスの逆シーケンスを行うことによって、データを解読する、項目11に記載の方法。
(項目13)
暗号化されたビデオの再生のためのシステムであって、少なくとも部分的に暗号化されたビデオデータが、コンテナファイル内に含まれ、前記少なくとも部分的に暗号化されたビデオデータは、暗号情報を使用して、基本ビットストリームを作成するために使用されることができ、前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータを復号するために使用することができ、
前記コンテナファイルから、前記少なくとも部分的に暗号化されたビデオデータを抽出し、基本ビットストリームを作成するように構成されているデマルチプレクサと、
前記暗号情報を使用して、前記基本ビットストリームを復号し、ディスプレイデバイス上にレンダリングするために、前記基本ビットストリームをデコードするように構成されているビデオデコーダと
を含み、前記デマルチプレクサは、前記暗号情報を符号化し、前記基本ビットストリーム内に前記符号化された暗号情報を挿入するように構成され、
前記デコーダは、基本ビットストリームから符号化された暗号情報を抽出し、前記暗号情報を解読するように構成されている、
システム。
(項目14)
前記暗号情報は、前記コンテナファイルから取得される、項目13に記載のシステム。(項目15)
前記暗号情報は、キー情報と、前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部に関する情報とを含み、前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部は、前記キー情報を使用して暗号化される、項目13に記載のシステム。
(項目16)
前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部に関する情報は、前記キー情報を使用して暗号化された、ビデオのエンコードされたフレーム内の暗号化されたデータのブロックの参照である、項目15に記載のシステム。
(項目17)
前記デマルチプレクサは、識別子によって区別された前記暗号情報を前記基本ビットストリーム内に挿入し、前記少なくとも部分的に暗号化されたビデオデータが、前記キー情報を使用して暗号化される前に、前記暗号情報を挿入するように構成されている、項目16に記載のシステム。
(項目18)
前記デコーダは、前記識別子を使用して、前記暗号情報を抽出するように構成されている、項目17に記載のシステム。
(項目19)
前記デコーダは、ビデオデータの暗号化された部分を識別し、前記キー情報を使用して、暗号化されたビデオデータを復号することによって、前記キー情報を使用して暗号化されたビデオデータの部分を復号するように構成されている、項目18に記載のシステム。
(項目20)
前記基本ビットストリーム内の異なる場所に挿入される暗号情報は、異なるキー情報を含む、項目19に記載のシステム。
(項目21)
前記少なくとも部分的に暗号化されたビデオデータは、エンコードされたビデオのフレームを含み、複数の前記エンコードされたフレームの少なくとも一部は、暗号化される、項目13に記載のシステム。
(項目22)
前記デマルチプレクサと前記デコーダとの両方は、符号化と解読との間の所定の時間を超過しての遅延が、前記暗号情報を回復不能にするように、同期されるように構成されている、項目13に記載のシステム。
(項目23)
前記デマルチプレクサは、データをスクランブルするために、スクランブル化プロセスのシーケンスを使用することによって、データを符号化するように構成されている、項目22に記載のシステム。
(項目24)
前記デコーダは、データをスクランブルするために使用されたシーケンスに対して、スクランブル化プロセスの逆シーケンスを行うことによって、データを解読するように構成されている、項目23に記載のシステム。
(項目25)
再生デバイス上で暗号化されたビデオを再生する方法であって、少なくとも部分的に暗号化されたビデオデータが、コンテナファイル内に含まれ、前記少なくとも部分的に暗号化されたビデオデータは、暗号情報を使用して、基本ビットストリームを作成するために使用されることができ、前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータを復号するために使用することができ、前記方法は、
前記暗号情報を取得することであって、
前記暗号情報は、前記コンテナファイルから取得され、
前記少なくとも部分的に暗号化されたビデオデータは、エンコードされたビデオのフレームを含み、複数の前記エンコードされたフレームの少なくとも一部は、暗号化され、
前記暗号情報は、キー情報と、前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部に関する情報とを含み、前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部は、前記キー情報を使用して暗号化され、
前記少なくとも部分的に暗号化されたビデオデータの少なくとも一部に関する情報は、前記キー情報を使用して暗号化された、ビデオのエンコードされたフレーム内の暗号化されたデータのブロックの参照であり、前記基本ビットストリーム内の異なる場所に挿入される暗号情報は、異なるキー情報を含む、ことと、
前記コンテナファイルから、前記少なくとも部分的に暗号化されたビデオデータを抽出し、基本ビットストリームを作成することであって、
前記基本ビットストリーム内に挿入される前記暗号情報は、識別子によって区切られ、
前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータが、前記キー情報を使用して暗号化される前に挿入される、ことと、
前記暗号情報を符号化することと、
前記暗号情報を前記基本ビットストリーム内に挿入することであって、前記暗号情報は、前記識別子を使用して抽出される、ことと、
前記基本ビットストリームをビデオデコーダに提供することと、
前記ビデオデコーダにおいて、前記基本ビットストリームから、前記暗号情報を抽出することと、
前記暗号情報を解読することであって、
前記符号化プロセスと前記解読プロセスとは、符号化と解読との間の所定の時間を超過した遅延が、前記暗号情報を回復不能にするように、同期され、
前記符号化プロセスは、データをスクランブルするために、スクランブル化プロセスのシーケンスを使用することによって、データを符号化し、
前記解読プロセスは、データのスクランブルを解除するために使用されるシーケンスにおいて、スクランブル化プロセスの逆シーケンスを行うことによってデータを解読する、ことと、
前記暗号情報を用いて前記基本ビットストリームを復号することであって、
復号プロセスは、ビデオデータの暗号化された部分を識別するために、前記キー情報を使用することと、前記キー情報を使用して、前記暗号化されたビデオデータを復号することとによって行われる、ことと、
前記ビデオデコーダを使用して、ディスプレイデバイス上にレンダリングするために、前記基本ビットストリームをデコードすることと
を含む、方法。
一実施形態では、認証および復号ブロック(デジタル著作権マネージャ15、25)はそれぞれ、共通探索法を使用して、一連の予測可能変換番号シーケンスを構築する。続いて、それらの番号は、キーをラップするためのキー材料に寄与するために使用される、付加的エントロピーのためのランダム値と組み合わせられる。
本発明の実施形態による、AVIコンテナから抽出されたビデオデータに関して利用される、ビットストリーム挿入プロセス400のフロー図が、図8に例証される。デマルチプレクサでは、発信者は、関連AVIチャンクの抽出(402)を開始し、最大予測ビットストリームペイロードのためのDRMを要求する(404)。次いで、デマルチプレクサは、DRMからの情報を使用して、バッファ内の空間を配分し(406)、DRMにバッファをパスする(408)。次に、DRM上で、ビデオDD情報が、キャッシュされる(410)。ビデオDD情報は、単一AVIチャンク内のビデオフレームデータのすべて等、コンテナデータの単一ブロック内に含まれるデータを記述する、ファイルコンテナ内のデータセグメントであり得る。暗号化されたフレームは、フレームのセキュリティ特徴に関連する情報を含む、DD情報を有し得る。MPEG4保留始動コードが、バッファに挿入され(412)、次いで、暗号ペイロードヘッダが、バッファに挿入される(414)。次いで、チャンクが第1のフレームであるかどうかについて、決定される(416)。チャンクが、第1のフレームである場合、Sync()ペイロードが、挿入され(418)、フレームInfo()ペイロードが、挿入される(420)。Sync()ペイロードは、ラップキーを同期させるためのラップキー同期ペイロードを含み得る。FrameInfo()ペイロードは、可能性として、DD情報データの一部として、暗号オフセットおよびビデオデータ内のデータセキュリティに関連する情報の長さを含み得る。チャンクが、第1のフレームではない場合、FrameInfo()ペイロードのみ、挿入される(420)。次いで、キーインデックスが、現在のキーインデックスより大きいかどうかについて、決定される(422)。キーインデックスが、現在のキーインデックスより大きい場合、FrameKey()ペイロードが、バッファに挿入され(424)、次いで、バッファに挿入されたバイト数が、DRMによって、発信者に返される(426)。FrameKey()ペイロードは、次のフレームキーを含むペイロードを含み得る。キーインデックスが、現在のキーインデックスより小さくない場合、DRMは、バッファに挿入されたバイト数を発信者に返す(426)。次に、デマルチプレクサは、AVIチャンクを抽出する準備ができる(428)。本プロセスを通して、DD情報アウェアネスは、デマルチプレクサが、デコーダへの伝送のために、ビデオチャンクをバッファに抽出する前に生じる。
Claims (20)
- 暗号化されたビデオを再生デバイス上で再生する方法であって、少なくとも部分的に暗号化されたビデオデータが、コンテナファイル内に含まれ、前記少なくとも部分的に暗号化されたビデオデータは、暗号情報を使用して、基本ビットストリームを作成するために使用することができ、前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータを復号するために使用することができ、前記方法は、
デマルチプレクサプロセスにより構成されたプロセッサを使用して、コンテナファイルから、少なくとも部分的に暗号化されたビデオデータを抽出することにより、少なくとも部分的に暗号化された基本ビットストリームを作成することと、
デマルチプレクサプロセスにより構成されたプロセッサを使用して、暗号情報を取得することであって、前記暗号情報は、キー情報と、前記キー情報を使用して暗号化された、前記暗号化されたビデオデータ内のビデオのエンコードされたフレーム内の暗号化されたデータのブロックの参照とを含む、ことと、
前記デマルチプレクサプロセスにより構成された前記プロセッサを使用して、前記暗号情報を符号化することと、
前記デマルチプレクサプロセスにより構成された前記プロセッサを使用して、前記符号化された暗号情報を前記基本ビットストリーム内に挿入することであって、前記符号化された暗号情報は、識別子によって区切られる、ことと、
前記デマルチプレクサプロセスにより構成された前記プロセッサを使用して、前記符号化された暗号情報が挿入される前記基本ビットストリームをビデオデコーダプロセスに提供することと、
ビデオデコーダプロセスにより構成されたプロセッサを使用して、前記基本ビットストリームから前記符号化された暗号情報を抽出することと、
前記ビデオデコーダプロセスにより構成された前記プロセッサを使用して、前記符号化された暗号情報を解読することと、
前記ビデオデコーダプロセスにより構成された前記プロセッサを使用して、前記解読された暗号情報を用いて前記基本ビットストリームを復号することと、
前記ビデオデコーダプロセスにより構成された前記プロセッサを使用して、ディスプレイデバイス上にレンダリングするために、前記復号された基本ビットストリームをデコードすることと
を含む、方法。 - 前記暗号情報は、前記コンテナファイルから取得される、請求項1に記載の方法。
- 前記符号化された暗号情報は、前記少なくとも部分的に暗号化されたビデオデータが、前記キー情報を使用して暗号化される前に、挿入される、請求項1に記載の方法。
- 前記符号化された暗号情報は、前記識別子を使用して抽出される、請求項3に記載の方法。
- 前記解読された暗号情報を用いて基本ビットストリームを復号することは、ビデオデータの前記暗号化された部分を識別するために、前記キー情報を使用することと、前記キー情報を使用して、前記暗号化されたビデオデータを復号することとによって行われる、請求項4に記載の方法。
- 前記基本ビットストリーム内の異なる場所に挿入される符号化された暗号情報は、異なるキー情報を含む、請求項5に記載の方法。
- 前記少なくとも部分的に暗号化されたビデオデータは、エンコードされたビデオのフレームを含み、複数の前記エンコードされたフレームの少なくとも一部は、暗号化される、請求項1に記載の方法。
- 前記暗号情報を符号化することと前記符号化された暗号情報を解読することとは、符号化と解読との間の所定の時間を超過した遅延が、前記暗号情報を回復不能にするように、同期される、請求項1に記載の方法。
- 前記暗号情報を符号化することは、データをスクランブルするために、スクランブル化プロセスのシーケンスを使用することによって、データを符号化する、請求項8に記載の方法。
- 前記符号化された暗号情報を解読することは、データをスクランブルするために使用されたシーケンスに対して、スクランブル化プロセスの逆シーケンスを行うことによって、前記データを解読する、請求項9に記載の方法。
- 暗号化されたビデオの再生のためのシステムであって、少なくとも部分的に暗号化されたビデオデータが、コンテナファイル内に含まれ、前記少なくとも部分的に暗号化されたビデオデータは、暗号情報を使用して、基本ビットストリームを作成するために使用することができ、前記暗号情報は、前記少なくとも部分的に暗号化されたビデオデータを復号するために使用することができ、前記システムは、
少なくとも部分的に暗号化されたビデオデータを含んでいるコンテナファイルから、少なくとも部分的に暗号化されたビデオデータを抽出することにより、少なくとも部分的に暗号化された基本ビットストリームを作成するように構成されているデマルチプレクサと、
前記暗号情報を使用して、前記基本ビットストリームを復号し、ディスプレイデバイス上にレンダリングするために、前記復号された基本ビットストリームをデコードするように構成されているビデオデコーダと
を含み、前記デマルチプレクサは、暗号情報を取得し、前記暗号情報を符号化し、前記基本ビットストリーム内に前記符号化された暗号情報を挿入するように構成され、
前記符号化された暗号情報は、識別子によって区切られ、前記暗号情報は、キー情報と、前記キー情報を使用してデータが暗号化された、前記暗号化されたビデオ内のビデオのエンコードされたフレーム内の暗号化されたデータのブロックの参照とを含み、
前記デコーダは、前記符号化された暗号情報が挿入される基本ビットストリームから、前記符号化された暗号情報を抽出し、前記符号化された暗号情報を解読し、前記解読された暗号情報を使用して前記基本ビットストリームを復号し、ディスプレイデバイス上にレンダリングするために、前記復号された基本ビットストリームをデコードするように構成されている、システム。 - 前記暗号情報は、前記コンテナファイルから取得される、請求項11に記載のシステム。
- 前記デマルチプレクサは、前記少なくとも部分的に暗号化されたビデオデータが、前記キー情報を使用して暗号化される前に、前記符号化された暗号情報を挿入するようにさらに構成されている、請求項11に記載のシステム。
- 前記デコーダは、前記識別子を使用して、前記符号化された暗号情報を抽出するように構成されている、請求項13に記載のシステム。
- 前記デコーダは、ビデオデータの暗号化された部分を識別し、前記キー情報を使用して、前記暗号化されたビデオデータを復号することによって、前記キー情報を使用して暗号化された前記ビデオデータの部分を復号するように構成されている、請求項14に記載のシステム。
- 前記基本ビットストリーム内の異なる場所に挿入される符号化された暗号情報は、異なるキー情報を含む、請求項15に記載のシステム。
- 前記少なくとも部分的に暗号化されたビデオデータは、エンコードされたビデオのフレームを含み、複数の前記エンコードされたフレームの少なくとも一部は、暗号化される、請求項11に記載のシステム。
- 前記デマルチプレクサおよび前記デコーダの両方は、符号化と解読との間の所定の時間を超過した遅延が、前記暗号情報を回復不能にするように、同期されるように構成されている、請求項11に記載のシステム。
- 前記デマルチプレクサは、データをスクランブルするために、スクランブル化プロセスのシーケンスを使用することによって、データを符号化するように構成されている、請求項18に記載のシステム。
- 前記デコーダは、データをスクランブルするために使用されたシーケンスに対して、スクランブル化プロセスの逆シーケンスを行うことによって、前記データを解読するように構成されている、請求項19に記載のシステム。
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2010
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US20170280203A1 (en) | 2017-09-28 |
US20150373421A1 (en) | 2015-12-24 |
EP2507995A4 (en) | 2014-07-09 |
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