Closed Digital Edition.
In the Finder, choose Go > Go to Folder.
In the Go To Folder dialog box, type ~/Library
Go in the folder Application Support > Adobe > Digital Editions and drag the activation.dat file to the trash.
Empty the Trash.
Restart the Digital Editon and authorze again.
I did that, then this message occurred:
Error getting License. License Server Communication Problem:
Check your Time, Date and Timezone.
What has that got to do with the message? Where would you go to do that?