I have created a form using Adobe LifeCycle Designer 7.1.

I would like to send this form to customers, have them fill it, save
it and email it back to me.
The problem is that Adobe Reader doesn't allow them to  save it.
I have tried to change the restrictions in the "document properties"
but the security changes i apply are not saved so "changing the
document" remains "not allowed".

I need to allow users to save the filled form. how do i do that?