Methods and apparatus for authenticating content in wagering game machines are described herein. In one embodiment, the computer-implemented method includes authenticating a first set of wagering game files stored on a storage device of a wagering game machine. The method can also include starting a wagering game on the wagering game machine if the authentication of the first set of wagering game files is successful. The method can also include authenticating, during the wagering game, a second set of wagering game files stored on the storage device of the wagering game machine, wherein the first set of wagering game files and the second set of wagering game files are mutually exclusive. The method can also include stopping the wagering game if the authentication of the second set of wagering game files is not successful.