Book protected by ADRM

I have been using ADE for several years.  On my second Kobo borrowing library  books.  Now, I am getting the error that says because I previously deauthorized my ereader I need to re-import the book.  I have done this several times.  Authorized, reauthorized.  Downloaded and redownloaded books.  Now, my kobo will not open any library books.  I even bought a brand new kobo with the same result.  Suggestions anyone?