RSS and search not protected

hello,

I found out that the RSS and search results are not protected. They are not protected no matter if the Aternative protection is ON (http://www.s2member.com/forums/topic/urgent-protected-content-not-protected/).

The protected content in our case is all under selected category,
WP: 3.6
S2M: 130802

I did the protection by my self like:

function FeedExcluder($query) {
 if (!is_user_logged_in() && ($query->is_feed || $query->is_search)) {
   $query->set('cat','-1');
 }
return $query;
}
 
add_filter('pre_get_posts','FeedExcluder');