The License Service provides common license inventory and management capabilities to the vCenter Server systems. When upgrading or migrating your vCenter Server deployment, licensing data is transferred to the License Service in the vCenter Server appliance.
When upgrading vCenter Server versions 6.5 or 6.7 that are connected to a Platform Services Controller, their licensing data is transferred to the License Service in the vCenter Server appliance. The licensing data includes the available licenses and license assignments for hosts, vCenter Server systems, vSAN clusters, and other products that you use with vSphere.
After the upgrade or migration of the vCenter Server systems finishes, the License Services stores the available licenses and manages the license assignments for the entire vSphere environment.
For more information about the License Service and managing licenses in vSphere, see vCenter Server and Host Management.