A novel method of watermarking text document is presented based on structure and semantic of Chinese characters. The method can convert Chinese text into bit string by defining four rules for four types of structures of Chinese characters, and then embed the watermark into the text by utilizing the word order change, the replacement of synonyms, the replacement of variant forms of the same word, the adding/deleting of the function words and the sentence compression and expansion. Experimental results show that the method can achieve a larger capacity and better imperceptibility and robustness.
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