There is a common joke in e-book and book digitization circles that paper is the original, and most effective, DRM available for books. This is mostly true, though anyone with a sheet-fed scanner quickly learns that it is a book’s binding that stops it from being easily digitized, not its paper. Yet, wherever things currently stand in the race between publishers releasing things in restricted formats and the public breaking those formats open to get at the tasty text inside, we can be sure of this, getting around the DRM on an e-book will never be more difficult than treating it like paper and photographing it normally.
When I tried just that using my book ripping camera mount I found that the OCR rates were almost identical vs the matching paper book, the page turning effort was reduced to almost nothing, and the speed was a comfortable ~750 pages/hour, where a “page” is the screen size of your e-reader.
So to anyone out there working on e-book DRM: I’ve got enough paper books (with bindings!) to scan already. Why not spend your effort on something more productive? Because this paper-DRM is only going to get even worse.