How will be the subscription when I install Norton product on 3 operating on one computer ?

Hi, all!

 

I've purchased a NAV 2009 license. Now in my computer has 4 operating : XP, Vista Sp2, Windows7, Ubuntu 9.04

 

Now, I install Norton Antivirus on all operating (except Ubuntu). My license is multi-user license (3 users).

 

It left 2 users (i plan use it as gift to my friend... ) but i don't know when i install it on all version the license will be subtract??

 

thanks everyone!