Updated devices rom but norton wants to give device new name

updated devices rom but norton wants to give device new name. norton reg won't allow me to use the name already assigned to the devices name for it's license. Now I've got a 2 licenses assigned to the same device. How do I free up a license? How do I avoid this problem again as I do change rom's often?

 

Norton Mobile Multi for 5 devices

Nexus 4

CyanogenMod 11