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Also make sure the time is right on your device. Having the incorrect date/time can cause issues with library books.
Also what firmware are you on for your Kobo?
I had problems with library books and ADE on one or two of the firmwares. For example, if I tried to open a book that was expired, any book I tried to open afterwards would also say it was DRM protected, etc. Another problem was if I left an expired book on my kobo and added a new one, the new one wouldn't work. But if I deleted all the expired books, then added the new book, it would work. This was years ago and I haven't had similar problems for a very long time, but I mention this in case you are on a very old firmware. I don't even think these were problems encountered by the majority, but I know I wasn't the only one that would get a frequent "DRM authorization" message on books that shouldn't have caused that message.
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