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free use pdf?

I found a pdf for an oreily book on the web, and it contains the following

If you can afford the cost of the book, please buy it from
It is fair to read the book, if you do not have money or can
not get this book by other means.
“the dark is worse than any copyright law” MGAAJM

Is this legit? Are oreilly books generally available for free use by those who can't afford them?
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