隨著網站服務的多元化，各網站逐漸進入web 2.0的時代。網站經營方式由原本的只能下載、閱讀，演變至可上傳、分享。每個數位文件的創作者在網站上分享個人創作文件的同時，不應該因為提出分享而讓其著作權受到傷害。一個可以讓數位內容著作者樂於將其著作出版分享之網站需要能維護創作者的版權，以防止未經授權之使用。
本文所提之數位版權管理(Digital Right Management, DRM)系統，可以管理數位內容的使用權利，限制使用者的使用範圍。並以無失真的浮水印嵌入法，在文件中每一頁嵌入數位內容提供者的專屬浮水印，達到保護所有權與鑑別的目的。本研究依X.509憑證技術標準，做為使用者身份的認證，且在文件的加密上同時採用對稱與非對稱式的相互配合，將文件加密後逕行傳輸，以確保文件在傳輸的過程中安全無虞。

With a diversification of web service, the website is gradually entering the web 2.0 ages. Now Webs are not only used for down load and reading the material of the web, but also the readers can upload their material to the web and share their experience. For these digital content providers, the copyright protection issue is the most serious problem for them.
In this thesis, a prototype of digital rights management (Digital Right Management, DRM) system is developed. In this system X.509 certification standard is used to do the user identity authentication. Lossless watermarking technology is applied to embed the specific watermark provided by the digital content’s owner into each page of his digital content for protecting the copyright. To encrypt the content for considering the security of transmission, both symmetric and non-symmetric encryptions are adopted.

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