Valve Anti-Cheat

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Valve Anti-Cheat (Client Side Anti-Cheat)

is developed by Valve Corporation and first released 2002. VAC works by scanning the users system for cheats while your game is running. It works a lot like a virus scanner, and has a database of known cheats to detect. Once a cheat has been detected, the user's account is marked for a delayed ban. A ban doesn't take effect immediately and instead is enforced a few days or weeks after the cheats are detected. Once a user ban is in effect, the user will no longer be able to connect to multi-player game servers that are marked as VAC secure.

Penalties after detection

• The account cannot join VAC secure servers for the AppIDs they are banned.
• The ban is publicly displayed on their Steam Community profile.
• The account can no longer share VAC enabled games.
• If the user is borrowing the game via Family Library Sharing, the ban is also applied to the actual owner of the game.
• Decreasing the trust factor score.
• Other accounts that have been linked to the same phone number, will get a ban.