Question concerning DRM in PDFs (have things changed since 2007?)

This may have been asked before - my quick search showed 2007 - which is now 5 years ago, so I'm sorry if things haven't changed - but better to be safe than sorry!
I wish to buy "android programming (2nd edition - 2012)", but want to be able to read it on many devices (android/linux laptop) so I was planning to grab it in PDF format.
Can someone tell me if there is now DRM restrictions on the PDFs you sell, and if so what restrictions are there?
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