Additionnal tags security

Hi

Me again.

Question about aditionnal tags plugins. Iframe can be very dangerous, so wanted to understand who has rights to embed an iframe whith it ?

I saw in the code
add_filter('edit_allowedposttags', 'additional_tags');
add_filter('edit_allowedtags', 'additional_tags');

What that means ?

Anyway to limit to superadmin this function ?