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There are two types of secure PDF as I know, Password Protected and DRM
The password protected is easy ro remove by Russian hacker serveral years ago and there are many software now.
Honestly, I collect over 20,000 PDF ebooks about 150 GB now. There are huge many soruces since fiction, Text book or Playboy magazine...
For DRM, I found only way now, Buy it and read on PC.
Last edited by keng2000; 11-27-2008 at 12:33 AM.
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