Managing Licenses page, “Remove license” confirmation dialog.
Choose one of the ESX(i) hosts/Clusters in the list and click the Remove button. The license assignment will be reset for the selected ESX(i) host and the licenses will be freed up. The licenses will be automatically re-assigned to this host if you perform backup or restore operation with any of the machines running on this host.
You would have to confirm removing the license binding by choosing Yes in the dialog.
Managing Licenses page, “Remove license” confirmation dialog.