Need Memebership Script With Access Sharing Prevention

Hi


I am willing to purchase Membership Mangment Script


which provide " Access Sharing Prevention features" so one login details can not be used by tow persons same time form different IP and can it will be blocked automatically


better with unlimited site license


Please suggest me few ones

Check these links for more details, these are the best for membership sites.

http://member.wishlistproducts.com/ and http://www.amember.com/p/