Chipset driver update reset 340 days of NIS to zero.

Hello,

just a quick query ,  i recently updated my motherboard chipset drivers and later that day when i woke up my pc i found that Norton Internet Security 2011 had shut itself off , i checked and it said " 0 days remaining" or similiar...and  displayed a red box saying subscribe.  I clicked on subscribe and it displayed a page saying " Thank You" and my 340 days were back.  My question is ,  does that use up an activation or can i do that countless times without worry  if it happens in future ?  Thanks.