The summary indicates, "Your subscription to Norton AntiVirus 2009 Gaming Edition includes automatic updates as well as access to new product features and updated versions made available during your service period." How long is the subscription/service period included for this price?

In the past when I purchased a Norton Antivirus product, it could be used on up to 3 PC's. This one does not say if it is for a single license or can be used on multiple PC's.

Thanks