Sets or returns the license key used for this instance of WordApplication. This property is mainly used for debugging purposes. For managing your license keys, please use the License Key Manager that is installed with OfficeWriter.

public System.String LicenseKey{ get; set; }
Public Property LicenseKey() As String
          //--- Return license key
          string key = oWordApplication.LicenseKey;

          //--- Set license key
          oWordApplication.LicenseKey = "XXXXXX-XXXX-XXXX-XXXXXX";
        
          '--- Return license key
          Dim key As String = oWordApplication.LicenseKey

          '--- Set license key
          oWordApplication.LicenseKey = "XXXXXX-XXXX-XXXX-XXXXXX"