Norton has expired on all household computers. Can I just purchase Norton Security Deluxe for all of them?

I'm a newbie so please forgive duplication of earlier discussions.  We have had separate Norton accounts for each computer (3) and all have expired.  Can I just go to Norton website and purchase Norton Security Deluxe without referring to old Norton on each machine?  In other words, do I have to search for keys, etc??  Win7 on all machines.