The Digital Download CDNs tab is where you configure any CDNs (Content Delivery Networks) you use for your digital download products.
The only allowed CDN is the Amazon CDN.
To configure your CDN, click the CDN in the batch list. In the box that opens, you can edit the name, set the Access Key, as well as enter and confirm the Secret Key for your CDN.
For more information on CDNs, visit the Digital Downloads page.