NetBackup Licensing with Oracle VM Linux/Windows VMs?

Greetings,

Could you please help us understand how NetBackup is licensed on Linux and Windows virtual machines hosted on Oracle VM? Oracle VM is Oracle's x86 server virtualization hypervisor, like ESX, Hyper-V, or XenServer.

We do not intent to run NetBackup on the ORacle Vm servers, i.e. the hypervisors, we do intenet to run NetBackup in the Linux and Windows VMs? the Linus and Windows VMs are running Oracle DBs, App servers / WebLogic, and Oracle EBS, and Exchange, and SQL Server. 

Is NetBackup is licensed per hosts, i.e. per hypervisor?

Is NetBackup is licensed per virtual machine?

Thank you,

Roddy