Ondrej Žilinec – IT Blog

When you buy Windows Server 2012 R2 Datacenter edition you don’t have to activate every Windows Server 2012 virtual machine (Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard or Windows Server 2012 R2 Essentials.). There is new license key for Windows. It’s called Automatic Virtual Machine Activation (AVMA). You have to active Hyper-V host operating system. Then you use one of following AVMA keys for VMs on your Hyper-V hosts:

You use this keys using elevated command prompt on VM:

slmgr /ipk <AVMA_key>

When you do all of these steps all your Windows Server 2012 will be automatically activated. Even without  access of Internet from VM.

I hope something similar will be deployed on VMWare virtualization.

More oficial from Microsoft here.