I believe the bootloader SHIPPED locked, meaning it can NEVER be unlocked. Don't hold me to that, but I'm fairly certain that is the case with the RAZR
Motorola could unlock the bootloader through means of a signed update.
A locked bootloader prevents one from writing to the boot partition, no kernel updates can be made to a device with a locked bootloader...nandroid backups can be had along with 2nd init ROMs.