The product key for this edition is unique because it serves as a secondary license Two-Step Activation:
: Includes everything in Windows 8.1 Pro, such as BitLocker drive encryption, Remote Desktop host capabilities, and Domain Join for corporate networks. How to Use the Product Key Windows 8.1 Pro With Media Center Product Key
As of today, there is no official way to purchase a new, unused, genuine Windows 8.1 Pro with Media Center product key from Microsoft or any authorized retailer. The product key for this edition is unique