License question

So, Im about to buy Comodo Internet Security Plus 2011. Its price is 39.99$. But the thing is, I cannot find whether its a license for 3 computers or just 1 computer. It reads nowhere in your page. I googled and saw some other pages selling CIS 2011 to 3 PCs for 39.99$, but now Im confused.

I just need to get a confirmation whether it will work on 3 PCs at the same time (as I have 3 PCs in my house) or would it only work on 1 PC.

It can be used up to three PC’s
1 Key = 3 Machines
Hope this Helps