Note: this is an add-on. You must have at least PrivateContent v2.3 to use it. User Data is a PrivateContent add-on that allow the creation of unlimited fields to use in unlimited forms. The main goal of this extension is to give you the means to built up an entire database and interact with your users.
Demo: http://codecanyon.net/item/privatecontent-user-data-addon/2399731