Is there a way for free site members (using prosite plugin) to be prohibited from editing the footer

Is there a way for free site members (using prosite plugin) to be prohibited from editing the footer (which is where I want to make the changes to the themes mentioned in link)?

link of previous question: https://premium.wpmudev.org/forums/topic/for-my-edublogs-like-site-where-can-i-edit-the-theme-templates-for-customers#post-255624