When you activate Adobe Digital Editions or access an eBook, the application returns the message "Adobe DRM Error" or E_ADEPT_IO."
Do one of the following solutions:
Note: DRM-protected books aren't available until the clock time reaches the time to which your clock was originally set.
Firewall, anti-virus, and proxy software can intercept the activation request from Adobe Digital Editions to the activation server. If you receive an error beginning with "E_ADEPT_IO," then your machine isn't allowing the connection to the activation server.
To resolve this issue, modify your firewall or other software to allow your machine to connect to the activation server:
To open an Adobe support web case, follow the 'Contact Technical Support' link on the Adobe Digital Editions Support Center.
Include the following information:
DRM errors occur for several reasons:
If you believe that you have firewall or proxy issues:
Adobe Digital Editions uses the following HTTP headers. These headers are open for both directions. The ports are the standard HTTP ports.