Valve Anti-Cheat

Valve Anti-Cheat is an anti-cheat system created by the Valve Corporation for the digital platform Steam. The system was first rolled out on Counter-Strike in 2002.

The system scans for modified files and will ban the player if it finds any modifications. The player may then be banned from all VAC-secured servers. This ban will be permanent and may place additional restrictions on the player's account. This ban could happen at any point, even weeks after the initial detection.

Banned users are unable to join the Steam Translation Server project, nor are they able to acquire a refund for the game, even if the other requirements are met.

List of VAC-enabled games

 * This is an incomplete list, please see this link for a complete list.