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  1. Microsoft Xps Viewer:pdf打印成xps，再打印成pdf
  2. http://www.wikihow.com/Unlock-a-Secure-PDF-File
  3. http://pages.cs.wisc.edu/~ghost/
  4. http://www.ghostscript.com/

posted on 2015-01-27 11:48  架构师师  阅读(86)  评论(0)  编辑  收藏  举报

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