Valve Anti-Cheat, Counter-Strike Wiki

Valve Anti-Cheat, otherwise known as VAC, is an anti-cheating system released by Valve in 2002. It was used mainly for multiplayer Steam games, including all main titles of the Counter-Strike series. When a player is detected cheating in a VAC-Secure server, the player will be marked for cheating and will get banned from VAC servers permanently. VAC bans are non-negotiable and cannot be removed. To obtain drops in Global Offensive, it is required to play in a VAC enabled server. Drops are unavai

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Valve Anti-Cheat, Counter-Strike Wiki

How to fix VAC was unable to verify your game session in CS:GO

Valve Anti-Cheat, Counter-Strike Wiki

Counter-Strike (video game) - Wikipedia

Valve Anti-Cheat, Counter-Strike Wiki

KQLY - Liquipedia Counter-Strike Wiki

rikz - Liquipedia Counter-Strike Wiki

Counter-Strike, Counter-Strike Wiki

Valve Anti-Cheat, Counter-Strike Wiki

Source - Valve Developer Community