Sentinel does a number of things – all designed to keep the device safe. It is an anti-virus program. When the user downloads a file that might have a virus, Sentinel will intervene and warn the user of the potential virus. There will be no reason I could think of where a good app will act like a virus. The same goes for malware. Sentinel will define the malware and warn you of opening the file. Sentinel is also a firewall which is very important for most systems. The only time a firewall might need configuring to allow certain incoming traffic will be on servers where that incoming traffic will be expected. Even then, Sentinel will use Artificial Intelligence to define if the incoming traffic is behaving correctly.
When Sentinel is installed on a KCI computer, the subscription is free. On other OSes, Sentinel will require an annual subscription. You would decide your “off” time. During this time, Sentinel will check the update server for new definitions. It will also check the computer after installing the definitions to make sure nothing new snuck in. Sentinel will be available on Debian based Linux applications, MacOS, and Windows. The annual cost is to develop programs for a different OS, and help cover for development of new definitions.