With this kind of protection, your system is less likely to be compromised. This means it protects your identity and privacy, protects your documents, financial files from ransomware, protects you from malicious and fraudulent websites and much more. On the other hand, Malwarebytes Premium stands guard against most known threats in real time. Malwarebytes Free has a limited scanner that scans your system for malware, trojans and other threats that have already compromised your device.