The Zerto Virtual Manager User Interface : Site Settings Dialog : License Dialog
  
License Dialog
The Zerto license includes the following details:
License – The license key itself.
License ID – An identifier for the license.
License Type – What is licensed: whether the license restricts the number of virtual machines that can be protected or the number of sockets used.
Expiry Date – The license expiry date.
Quantity – The maximum amount licensed, either virtual machines or sockets, based on the license type. If blank, the quantity is unlimited.
Maximum Sites – The maximum number of sites allowed.
Usage – The sites using the license and number of protected virtual machines in each site. In VMware, the number of virtual machines is independent of whether they are in vApps.