According to the OT Security 7.6 Architect study guide regarding IEC 62443 Security Levels :
Security Level 4 (SL 4) Definition : This level provides "Protection against intentional violation using sophisticated means with extended resources, specific skills, and high motivation".
Real-World Application : The study guide specifically notes: "If you are facing a syndicate of cyber extortionists with extensive resources and capabilities, then you should strive for security level 4".
Comparison to other levels :
SL 1 : Protection against "casual or unintentional system violation".
SL 2 : Protection against "intentional violation using simple means with low resources".
SL 3 : Protection against "intentional violation using sophisticated means with moderate resources".
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