Remaining Activations

Hi,

 

I purchased Norton Internet Security in 2007 and had it renewed and updated every year. The service is protect for 3 PCs but I have never installed Norton on another computer. However, my account mentions the remaining activations is none. I'm assuming I cannot add the 2nd license if I buy a laptop. What is the reason for my account listing the remaining activations as none? Has renewing Norton every year taken away the other two licenses? Thanks