For five years I have found it impossible to open books in ADE. For the last four I have done my best to never buy one in that format. Now an academic publisher only makes ebooks available this way. I have followed the de-authorize, close, delete Library file, re-open, re-authorize instructions 20 times... I still get this error.
Error getting License. License Server Communication Problem:
This is a major publisher and the book was purchased from ebooks dot com where my log in is through the same email as my Adobe ID.