論文摘要
關鍵字: 數位版權管理系統，動態向量反轉
由於網路的普及，人們可以方便地交換資訊，然而，使用者可以很容易地拷貝，處理及任意散布這些數位影片，因此，要如何保護這些數位影片以避免非法存取的情形是件很重要的問題。因此，有人提出了數位版權管理系統的概念，籍由此系統，可以保障數位影片的版權，只有經過授權的使用者才能正確的觀看影片。
在這篇論文中，我們提出了一個以改變動態向量方向為架構的影片數位版權管理系統，籍由此系統，只有購買並取得授權的使用者可以看到完整的影片，如果是未經授權的使用者，只能看到品質非常低劣的影片。
在我們的論文中，也提出了整個數位版權管理系統的架構，包括了使用者要如何去購買，並且取得觀看的權限，我們所提出的系統可以應用在許多不同的視訊編碼標準上，像是 MPEG、MPEG-2、MPEG-4 及 H.264。同時我們的系統具有擴充性，如果未來有更好的演算法，也可以直接應用在我們的系統上。

Abstract

Key words: DRM, motion vector inversion
Due to the growing speed of the networks, users can share information in a convenient way. However, users can copy, alter and distribute the multimedia content easily. Thus, how to protect the content’s rights from the un-authorized access and other illegal accesses becomes an important issue. The digital rights management (DRM) system has been developed and proposed to protect the intellectual property rights of contents and prevent illegal behaviors of users. Only the authorized user can play the video correctly.
In this thesis, we have proposed a DRM system for video based on the motion vector inversion. By using this method not only the authorized user can watch the video but also the un-authorized can watch the video in low quality.
Our DRM system also shows the overall procedure if the user wants to buy the video and our system can be applied to the block based video encoding standards such as MPEG, MPEG-2, MPEG-4, and H.264 etc. We provide the flexible, if in the future there is a better algorithm that can be easily applied to our system.

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