Another of F-Secure's selling points is the Gatekeeper, which, like VirusScan's VirusShield, actively scans files for you in the background. In addition to being used for common tasks like checking files on a floppy disk or scanning the contents of a compressed archive, F-Prot Gatekeeper is specifically designed for Internet use, protecting your computer from viruses that have been transmitted over the Internet.
Using advanced Dynamic Virus Protection technology (DVP), Gatekeeper checks all your e-mail messages and downloaded files as they arrive, ensuring that any viruses embedded in the Internet content are detected and removed before they have the opportunity to infect your computer. The real-time background scanner detects traditional viruses as well as polymorphic and encrypted viruses.