Adobe Digital Editions

Thanks everyone for helpful suggestions. I didn't have to do anything, the next day I plugged in ereader to computer and brought up ADE and a box came up that said something hadn't finished, do you want to continue?? and I clicked to continue and when that was done I dragged the book to the ereader icon, waited a bit after the loading showed finished  and then did the 'eject' process  and this time when it came up on my ereader it was unlocked??????  Some little glitch I guess, maybe I didn't wait long enough for the book to load properly even tho the loading appeared to be finished. I really didn't want to go the route of changing to factory settings because I believe you lose any books you have purchased. Another time when this happened I was trying various things and it removed ALL of my books fromm the ereader, now that was sweating time lol I just kept ejecting and reconnecting and eventually they all came back.