【摘要】 针对文本文档的真实性、完整性和版权保护问题,通过分析PDF文档和Postscript页面描述文件工作机制原理,提出一种专门针对中文PDF文档的数字水印算法。将根据原始文档字符特征码而生成的水印信息嵌入到文档字符间距中,从而实现了对文档内容的保护。实验结果表明,利用该算法使得中文PDF文档具有了良好的防篡改性。更多还原

【Abstract】 With the appearance of the problems in the truthfulness, completeness and copyright protection of documents, a digital watermarking algorithm specially towards Chinese PDF documents is put forward by analyzing the working mechanism of PDF and PostScript. The watermarking information originated from the features of the PDF character codes of original documents embeds into the spaces between characters of documents, therefore the protection is realized for the content of documents. According to the results of experiments, the application of the algorithm could offer better anti-modification features to Chinese PDF documents.更多还原