SL1–SL5
RAND's weights-security levels: SL1 resists amateurs, SL3 cybercrime syndicates, SL5 the most capable state operations — the guide's scale for model-theft defense.
Also written as: SL1 · SL2 · SL3 · SL4 · SL5
Current numbers
SL1–SL5 map to OC1–OC5SL1–SL5 are defined by the attacker operational-capacity tier (OC1–OC5) they must thwart, not by a time-to-theft window
5 levels / 5 tiers / 38 vectorsRAND Weights Security Levels (SL1–SL5), attacker operational-capacity tiers (OC1–OC5), and catalogued attack vectors