I am having a similar problem. I have downloaded plenty of library books to my Kobo previously, but now with Adobe 4.5 I am able to open and read my library books on my laptop, but when I open them on my Kobo, I get this message: "Oops!.... This document is protected by Adobe Digital Rights Management and is not currently authorized for use with your Adobe ID..." My Adobe Digital Editions 4.5 is only paired with one account, and I've checked to make sure that that account number matches the Adobe account number on my Kobo, and it does. So frustrating!
This is the exact same problem I am having. Extremely frustrating! The problem is recent. Previously I never had any difficulties transferring books from my desktop ADE to my Kobo and reading them on my Kobo. I am adding my comments here in the hope that someone will see our plea for help and resolve our difficutlies.
Now, I am able to read library books in ADE 188.8.131.52054 on my Macbook running OSX 10.11.2, and I have no problem transferring files to my Kobo. But when I try to open them on my Kobo, I get the same message: "Oops! This document couldn't be opened" due to DRM issues. My Macbook and Kobo both have the same valid adobe ID authorization. I can also download and open Toronto library books onto my iPad and read them in the Overdrive app.
I have done a factory reset on my Kobo, ensured that the Kobo is running the latest version, uninstalled and re-installed ADE on my Macbook, deauthorized and reauthorized both my Macbook and Kobo. Nothing has worked.I am stuck!
Do any other readers out there have any suggestions?
If you’re having trouble getting library books on a kobo (quite probably a new one because changing things typically causes problems), try deleting all authorizations - (on your computer and on your ereader, but keep the ereader connected.) Then go to your public library website and get a NEW book - (something about trying to open a book that you already took out somewhere, causes a glitch - for example if you previously opened a book on a tablet or phone, then that’s it - there will very very likely be NO OPENING it elsewhere, so make sure it is a newly borrowed one. If you are out of new borrows, you will have to use adobe digital editions to RETURN one your digital library books. CLOSE and reopen ADE so that the return definitely happens). After deleting all authorizations (check in all locations to make sure it shows no authorizations), download the new book to your saving spot, then click it to make it open in adobe digital editions: Adobe will then PROMPT YOU for the authorization. Use the drag down menu to find your library’s license type, for me it is Overdrive. Then enter your (Overdrive) email address and password. This should cause the book to open AND it also should cause your connected ereader to become authorized at the same time. Click the back button at the top and then click your ereader, and then it’s gear sign to look to see if the ereader is also authorized. Even if it is not authorized, try dragging the new book onto it. This should work immediately (as it did for me), or it should ask for an authorization. You can then click on the ereader (not on all items) and see if you can open the book as it sits in the ereader area. If it opens there, you should be good.