for the mac:
# Mount the ipod (plug it in)
# Navigate to X
iPod_Control\Device\ (where X is the drive letter of the iPod)
# Find the file called "_locked" and open it with Notepad or TextEdit
# There's your code.
for the pc:
# Plug the ipod into the computer
# Go to My Computer--->Your iPod Drive--->iPod_Control--->Device
# Find the file called "_locked" and open it with Notepad
# There's your code.