The Crack Patch 603 is a cracked patch for FM 2006 that was released by a group of gamers who sought to bypass the game's copy protection. The patch, which was not officially sanctioned by the game developers, allowed players to play the game without a valid CD key or activation code. This crack patch was not only used to circumvent the game's DRM (Digital Rights Management) system but also to patch the game to the latest version, 10.3.0.