The Ultimatrix Security Keys are two special keys to used to give access to otherwise locked DNA of certain aliens in the Ultimatrix. In order to prevent himself, and by extension, Albedo, from becoming certain transformations like Alien X, Ben had their DNA locked and the keys created to return access to him in case of an emergency. Ben gave the keys to Gwen and Kevin. The security system and its keys fell out of use when Ben received a new Omnitrix from Azmuth. The Omnitrix so far does not have something similar to the Ultimatrix security system, and Ben can become Alien X freely.