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Install Calibre and then follow the instructions here: http://apprenticealf.wordpress.com/

If it's not DRM protected, but rather a "secure" PDF, you'll need some other tools that can remove the owner password. About.com has a list here: http://pcsupport.about.com/od/toolsofthetrade/tp/pdf-passwor...

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Please don't password protect PDFs for books. It makes it a huge pain in the ass to actually read. I'd much rather you do what the Pragmatic Bookshelf does and just embed our name into the PDF.

As far as I can tell, O'Reilly doesn't even do that. I've even strings(1)'d them and found nothing.

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