Digital Editions is not a part of Creative Cloud subscription. It's a free application which you can install from the below link.
To know more about Adobe Digital Editions, click on this link. http://www.adobe.com/in/products/digital-editions.html
Hope that Helps!
[Moved the discussion to Adobe Digital Editions Forum]
Thank you for the information.
Can you advise the position with regard to Adobe Digital Publishing Suite family