隨者科技快速進步，印表機、影印機、掃描機等複製設備已逐漸的普及，透過這些儀器，便可快速及精準複製文件；然而，因複製科技的設備不斷的更新，偽造者亦可藉由這些設備製作出高品質的複製品，以致版權受到極大的威脅，以往版權宣告的浮水印技術大多是隱藏版權擁有者的圖案，但無法有效降低因非授權複印之損失；本研究目的在提出以不同網點所混合的數位浮水印技術，可以在複印後改變文件內容，使其複製後文件之內容與意義改變，達到版權保護的目的。本研究以混合調幅網點及調頻網點的方式來設計浮水印，藉由調幅網點與調頻網點在複印機或掃瞄機等不同的偵測設備上的取樣差異，浮水印經目視觀察時，此文件外觀及意義並無差異，但文件經由影印機或掃描器等設備複製後，原稿內容消失，而隱藏之浮水印即顯現，使非授權印製品無法有相同內容，甚至改變其意義，未來將此技術將可以應用於一般文化書籍或是漫畫書上，不僅可以宣告版權，更能嚇阻非授權複印。

The objective of this research is to design an anti-copy method by watermark with hybrid halftone dots of amplitude modulation (AM) and frequency modulation (FM). This research gives the digital watermark the other alternative to declare copyright. The watermark will appear by duplicating the original document, and the content of the document is altered. It will have many potential applications such as secured document, comic books and etc.

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