NIS 3 user licence, and a 4th PC

Hi all,

I have a 1 year licence for 3 machines. I have activated it on every one of them.

However now I decided not to use internet on one machine (it's been formatted).

Can I use my still valid key on another machine/give it to a friend?

 

I think it can be done if I enter my Norton Account details on that 4th machine.

Is that true?