定義了多媒體公文的新概念，在分析傳統電子政務安全架構的基礎上，提出利用數
字水印技術來提高多媒體公文的安全性，并以PDF 文檔為例介紹了如何利用數字水印技術來維護信息內容的創作權，彌補了電子政務系統對數字作品版權保護的不足，設計了一種新的基于數字水印的多媒體公文安全架構。
關鍵詞：數字水印；多媒體公文；安全架構；電子政務
Abstract: The new concept of multimedia document was defined. According to the analysis of
traditional security architecture of E-government, a new idea about adopting the technology of digital watermarking to ensure in the security of Multimedia Document was proposed. It
introduced a way how to maintain copyright protection information in PDF documents with digital watermark technology, and made up the drawback of the digital work copyright protection in E-government system; Finally, based on the digital watermark, a new security architecture of multimedia document processing system is designed.
Key words: digital watermarking; multimedia document; security architecture; electronic
government