DPM 2010 + HyperV licencing

Can anyone clarify exactly what licences I will need here;

I have 2 DPM servers

2 HyperV servers running various OSs including around 6 windows hosts.

5 physical Windows servers



Anyone any idea of how many DPM licences I will need as the 2 companies I have went to for information have said different things.

Thanks

My understanding is that you should need this:

9 Windows Server Licenses, 2 for the DPM servers, 2 for the HyperV servers and 5 for the physical servers.
2 System Center Data Protection Manager 2010 Server ML Enterprise licenses to back up the DPM servers (license for the software is included).
2 System Center Data Protection Manager 2010 Server ML Enterprise licenses to back up the HyperV servers.
5 System Center Data Protection Manager 2010 Server ML Standard or Enterprise licenses to back up the physical servers depending on what they run. (Standard is fine for BMR/Files but Enterprise is needed for SQL/Exchange etc).

HyperV requires no additional licenses for 4 of less VMs per host.

Note that with the above model (2 licences for the Hyper-V servers), I believe you can only install the agent onto the Hyper-V hosts, not onto each guest individually. This could potentially mean less functionality if the guests are running SQL/Exchnage/SharePoint.