Whell I have thourt about some waye to make the unit less ideal for teifs:
empeg keeps an record ower hwo the owner is raido ID=owner´s name
eatch unit save it owner´s name in the flash, normal upgrads dont change the name.
you will neet a special change name file from empeg to change, the file is sent to the registred owner of the unit.
if ID in file dont match the unit´s id name is't change
the unit cut alsow be protected by a password that will prohibit download to the unit, ther by making the unit usles

the name is shown at eatch boot

Mark
emaks rouls