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可權限轉移之數位版權管理系統的研究與實現

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圖 2-5 ODRL 語法架構
圖 2-7 XrML 語法架構
圖 2-8 MPEG-21 REL 語法架構  接著我們簡單介紹如何由REL來形成License,以下用MPEG-21 REL來作一 說明。首先如圖2-9所示為MPEG-21 REL語法的基本資料結構,而其基本概念為 主體(Principal)可在某種條件(Condition)下,對於特定資源(Resource)享有某種版 權(Rights)。接著對於MPEG-21 REL的四種基本元素分述如下:  (1)  主體(Principal):一般由資源的提供者(provider)、使用者、傳播者或管 理者對於每
圖 2-10 MPEG-21 REL 的 License 範例  至於ODRL、XrML與MPEG-21 REL在權限轉移方面的描述能力,探討如下:  z  ODRL:在 ODRL當中,「give」有將Rights整個轉讓的意味。give的定 義是,允許資產作所有權的轉移,而且是永久性的所有權轉移,不必有 付費的動作。亦即,「give」這個權利元素,其意義不帶價值交換。相 對的另一個權利元素「sell」是要金錢交易的。還有一個權利元素 「transfer」,似乎也有將Rights作轉讓的意味。但實質上,以上
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