I was using Adobe Digital Editions with no problem for a couple of month. Then I got an error when I tried to upload a book from the library "Error getting License. License Server Communication Problem: E_AUTH_BAD_DEVICE_KEY_OR_PKCS12". I tried removing and re-loading the program but that did not help.
Please follow below steps:
1. Uninstall ADE
2. Please download the latest ADE 126.96.36.199585
3. Launch ADE
4. Help -> Erase authorization.
ADE will be deauhorized.
5. Now again AUTHORIZE ADE
Help-> authorize computer.
Note: After this, you will not be able to open books that are fulfilled using anonymous accounts (authorized computers without an ID).