Originally Posted by Sharkus
The Harry Potter books are certainly DRM free. I'm specifically looking at the iOS app and I don't see any form of encryption on the files (for obvious reasons I'm not going to say where I'm looking and what I'm looking for). There will be some digital watermarking applied, which is how Pottermore can track where any pirated copies of the book come from.
Correct they are free of traditional DRM when downloaded directly from Pottermore and instead are watermarked (socially DRM'd). They do however have traditional DRM when downloaded from linked retailer accounts.