What is the Badlion AntiCheat (BAC)?
The Badlion Anti-Cheat, also known as BAC. is a client-side anticheat that was developed by ESL/ESEA for the Badlion Client. BAC will detect if you are running a cheat on your computer and issue a ban against your account if you are caught cheating when playing on a BAC enabled server (please note, we don't consider autoclickers cheats anymore).
How can I use BAC?
BAC can only be used in BAC protected servers. A list of BAC Protected servers can be found on the multiplayer tab, in the top middle-right area of the section.
How do I know if BAC is Active?
When you join a BAC Protected server the following loading screen should show up. The loading screen represents the fact that the BAC driver is being activated and will be active while you are on that server.
You will also see a difference in your launcher, when BAC is inactive then the lock will be red.
However when you join a BAC protected server then the lock will turn green and close.
How do I know if BAC is Inactive?
BAC will be inactive if you join any other server that is not BAC protected, therefore you will not see the loading screen that is shown in the question above. And the lock on the launcher shall remain open and red like in this picture.