Fairplay Anticheat Software is an application made for Soldier of Fortune II: Double Helix. It has been the prominent anticheat software since 2007 and is used daily by players of the demo and full versions of the game. Fairplay continues to grow as the creation of a sof2 player named Shifty. Fairplay anticheat's purpose is to provide a fair, cheat-free platform for video game users to be able to play with each other without the bother of hackers and cheaters, both competitively and non-competitively.

Fairplay needs the Microsoft .NET Framework to work. You can download it here.

The allowed pk3 list including download links can be found here.