When you open/download a eBook before you authorize Digital Edition its can read only on this device and no transfer to other device. Only help is ask your reader for a new file which you can linked right with your Adobe ID. (Authoirze Digital Edition before you download again).
the problem was fixed with Adobe Digital Editions Version 4.5.
You need to go to Help -> Erase Authorisation and then re-authorise it with your Adobe Digital ID again.
I am trying to open an ebook I booked from a library. The problem is that I download it and opened it in Adobe Digital Ed. without indicating an ID. Now I can't give the ebook back, and I get this error all the time: E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER.
It doesn't work, even if I erase authorisation and re-autorise with the library ID before downloading the file again. The same error appears.
Could you help me with this?
this issue has to be fixed by your book provider (not by Adobe).
The error shows that the book has been already downloaded with another account or without an ID.
You need to contact the customer support of the book provider and ask for a new "token". What they need to do is to reset the license of the books that you have downloaded without an ID and assign to the download link a new ACSM file.
It worked for me.