It depends on the use you are intending. If you are using them on client websites, you will need a 1 year developer, which allows you to use our templates on any domain for anyone.
If its just for you, you need a standard 1 year - unlimited domains, so you can use it on as many sites as you like, but they must
be a personal or personal business site of yours.
Hope that helps
More here: http://www.shape5.com/terms_of_use.html