“HTC is committed to listening to users and delivering customer satisfaction. Since announcing our commitment to unlockable bootloaders, HTC has worked to enable our customers to unlock the bootloader on more than 45 devices over the past six months. In some cases, however, restrictions prevent certain devices from participating in our bootloader unlocking program. Rest assured, HTC is committed to assisting developers in unlocking bootloaders for HTC devices and we’ll continue to unlock additional devices in the future.”
While we’re sure that the Android community will no doubt find a way around it, we guess that as far as official bootloader unlocking is concerned, owners of the AT&T HTC One X are simply out of luck.