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I don't know about RWH PDFs from O'Reilly, but all the content in that book was made available on the author's website.

They did sort of an open editing dealy.

I was pretty sure you needed to buy the book before you get that, I tried to follow links for a while to get the RWH pdf before and didn't succeed.

Edit: Seems that they are linking only to the site and not a pdf for RWH so it could well be legal :)