I have exceeded the allowed number of devices with my Adobe ID

Once you have exceeded six activations, you will need to contact Adobe directly to request a reset of your Adobe ID: www.adobe.com/support/digitaleditions.

Then complete the following steps:

On the right side of the page, click on "Submit a web case".
Log in with your Adobe ID
At the bottom you will now find "Choose issue type". Select "Using a Product or Service".
Now select "Additional Products
Select "Adobe Digital Editions

Now the support form will open. As "Brief Description" enter: "Please reset my Adobe ID" and under "Please describe your issue" type in the reason for your request.