The S3 license is the most comprehensive tier available for Live for Speed. In version 0.7D, having an S3 license unlocks:
Support for up to 40 grid slots and 79 online connections. lfs s3 unlocker 7d
Live for Speed uses an internet-based activation system. Users who buy an LFS License from the official LFS Shop receive a unique username and unlock code. Introduction - LFS Manual The S3 license is the most comprehensive tier
All 20 vehicles and 9 environments, plus all configurations. plus all configurations.