"-IF you have a NIC card and leave that alone, you can change up to 6 other components at a time before it gets 'tripped.' -OR, If you don't have a NIC, then it would mean 4 things at a time before it would get tripped, -OR- -If you have an OEM version pre-installed, then it would focus on the motherboard and BIOS. You can update the BIOS, but switching for a new mobo/BIOS would. Also, after 4 months, the product activation loses its 'grip,' meaning that it would just assume everything is cool on that system; then, you COULD install the OS on another computer, but you might have to call MS for it. However, they are willing to give you the benefit of a doubt. So the only ones that REALLY have to worry about such 'protection' would be the ones who pirated a copy of the OS. " It's quoted from elsewhere, but, that's supposedly it. Doesn't sound too sinister.