保密纸：有着难以仿制的特征，如水印等的纸张。
Security paper: paper incorporating features, such as watermarks, etc, which make counterfeiting difficult.
实际上许多纸张文档比音频、视频或图像之类的多媒体更有价值，对文本数字水印的研究能够有效保护文本形式作品的知识产权。
In fact, the paper document is more valuable than other digital medias. To some extent, the study of the document watermarking can preserve the intellectual property effectively.
本发明涉及安全基片的改进，尤其涉及带有水印的如纸张之类的 纤维安全基片。
The invention relates to improvements in security substrates and in particular to fibrous security substrates, such as paper, incorporating a watermark.
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