SL | Description |
SL-1 | Protection against casual or coincidental violation. |
SL-2 | Protection against intentional violation using simple means with low resources, generic skills and low motivation. |
SL-3 | Protection against intentional violation using sophisticated means with moderate resources, IACS specific skills and moderate motivation. |
SL-4 | Protection against intentional violation using sophisticated means with extended resources, IACS specific skills and high motivation. |