InfoPath Dev

 I'll be posting the form on SharePoint. is there a way to save it as XML so they can't change it?

i am looking for a way to prevent users from being able to modify the form template by right clicking it and going into design mode. it is a form where they need to input their information and then have their supervisor digitally sign it. they still need to be able to use the form, just not modify the form design. is there an easy way to do this ...