Deep Security drivers are digitally signed by Trend Micro and not by the OS vendor. When the OS is loading the driver, it is not able to verify the Deep Security driver signature and eventually shows this warning.

The log entries are expected. Please consider this as normal behavior and ignore the message.

The log will be printed only when the first time the driver is loaded, i.e., the first time we enable DSA modules. After that, when DSA is restarted, it will unload and reload the driver, then no more error logs will show.