I may be mistaken, but i believe if you pay for the book, that book HAS to have DRM. Otherwise one person buys the book and he can share it with anyone. That's not good for the business lol. Also, if you have to create an account and sign in most likely the books will be DRM'd.
About your other question, I do believe all sellers include DRM for one particular book, because they make deals with the editorial houses so I would say yes, the same title will be DRM'd everywhere
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