Bdis2008 On Three Pc's

I am running BDIS2008 on three PC's, which is what my license allows. What I would like to know is how does Bitdefender track this, do they use MAC addresses, as surely the IP would be the same through a router; what about if I go through a different router?


My reason for asking is not that I am trying to abuse my license, but that if I uninstall from one PC to use on another, how will BD know I have uninstalled one, other then the fact that that machine will not be updating. I'll possibly be upgrading one of my laptops and this is another reason I ask the question.


Just for the record I am amazed at the problems people seem to have, especially with the Total Security version. I have been with BD for many years and I'm currently running BDIS2008 on XP Home, XP Pro and Vista Premium and it's just does the job for me, with very little fuss.


Rgds


Mick