I am going to buy BitDefender Internet Security as I have a lot of good reviews about it. I have gone through the website and have seen that it protects 3 PC's for a year. What does it actually mean? My other question is, suppose I have installed BitDefender once and after a while, I have to format my system for some reason. Will I be able to get the license once again? Or is it that I will get only 3 licenses (as in 3 PC's) and after the 3 licenses, I have to again purchase new BitDefender pack. And if I buy online, will a CD be sent to the mailing address or will I have to download it online? Would appreciate if these questions are answered.