Read Out Loud on iPad only reads the page number in Digital Editions

On my Samsung galaxy tab, pocketbook can indeed open and read my books in Adobe digital editions

Unfortunately, I think that Digital Editions deliberately blocks copying text or text recognition which is incredibly bad from an accessibility perspective. The lack of compatibility with read aloud (and lack of embedded read aloud feature) has been discussed for years with Adobe stating that you need to go back to the publisher for a different version if you want accessibility (I saw posts from 2008 identifying this as an issue people wanted solved).

You can find some work arounds involving screen capture, but my understanding is that these work arounds involve you capturing text page by page, so not really practical if you want to read an entire book. 

I would also like the ability for read aloud (preferably embedded in the app), but based on comments through the years, it does not seem like a problem Adobe is willing to invest in solving. Sorry to not be able to provide a more useful answer, but unfortunately, I think the answer is that the program is designed to interfere with read aloud.