I have purchased a textbook in Adobe Digital Editions format. It installed on my computer (iMac) with no issues but I am unable to get the book to show up on my iPad. Both are running the latest version of Adobe Digital Editions (I had to upgrade the version on my iMac and reinstalled on my iPad) but still no sync (although sync is enabled). I believe I resolved this problem las time by transferring the ascot file to the iPad but this time Digital Editions on the iPad is reporting "Unable to download, Error getting License. License Server Communication Problem: E_AUTH_BAD_DEVICE_KEY_OR_PKCS12". Help!
Auto correct issue... the filename is URLLink-2.acsm
Try searching forums for E_AUTH_BAD_DEVICE_KEY_OR_PKCS12