Automatic Virtual Machine Activation AVMA in Windows Server 2012 R2

The Automatic Virtual Machine Activation is a really great feature in Windows Server 2012 R2
So read more how to configure it, it is very easy link

For faster access to the serials attached, provided in the link above

Datacenter	Y4TGP-NPTV9-HTC2H-7MGQ3-DV4TW
Standard	DBGBW-NPF86-BJVTX-K3WKJ-MTB6V