Installing Leopard on a PC may also violate Apple's official terms and conditions, although it is unknown whether this leaves it vulnerable to the same sort of disabling updates that have affected iPhone hackers. Apple has coped with previous hacks of Mac OS X by attempting to locate those supplying instructions, and taking whatever means necessary to prevent distribution. This leaves those wanting to run Mac OS little alternative but to buy Apple hardware, as no virtualization software currently works without access to at least one Mac computer.