Use Microsoft Hyper V Server 2012

Hi All,

Can I use free version Microsoft Hyper V Server 2012 on production Network or it for testing purpose only?

if yes than what licence is required if I install 4 nos. Windows 8 VMs. is it

2 Nos. of Windows Server 2012 Standard

OR

4 Nos. of Windows 8 Licence?

Regards,