I have paid for McAfee for years now and found it to be pretty good.
Recently they have been emailing my sayoing that I am running it on 4 computers and only have a licence for one. I don't have 4 computers !!
a couple of possible explanations
1. somebody else is using your license without your knowledge
or;
2. McAfee assumes that many, like me cheat, and load it on other computers without McAfee knowing or paying and they are just taking a shot in the dark that they can get more money out of you.