Quote:
Originally Posted by gdlow
How do we determine which books, when buying from a site or even those on our Kindle/Nook/etc have DRM, etc associated with them? 
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Amazon has PID based DRM
nookbooks have username/credit card based DRM
Apple has Fairplay DRM
Sony and the rest of the world selling ePub uses Adobe Adept based DRM
PDF uses Adobe Adept DRM
Mobipocket uses PID based DRM
MS Reader uses a DRM I am not sure about
eReader uses username/credit card based DRM
For DRMed eBooks...
Amazon sells AZW & Topaz
Sony sells ePub
Barnes & Noble sells ePub
Apple sells ePub and non-standard ePub since iBooks has features that are not part of the ePub specification
Fictionwise sells eReader
Mobipocket sells Mobipocket