Microsoft Windows Server 2012 - 1 Device CAL OEM. A CAL is a Client Access License and is required to access Windows Server 2012 Standard or Datacenter. This allows a single device to separately access the instance of Windows Server 2012 that requires a CAL by any number of users.

Features:

Backwards Compatibility
Windows Server 2012 CALs provide access to Windows Server 2012 or any previous Windows Server version.