This read-create string holds human-readable administrative information associated with an activation key, such as a product serial number or a demo key's registration date; some key formats require a vendor-supplied License String value, which must be set before the row's etsysActivationKeyStatus can become active and cannot be changed while it is active. Admins set this when a license key format requires a paired vendor-provided string alongside the raw key value. For example, an admin enters the product serial number "SN-778899" here as required by a vendor-issued license key before activating the row.