restrict access to public site

Hi all,
I need restrict access to public site and nobody can see the content if it's not logged In .
I searched in the forum, but i not find information for this situation.
thanks If someone have any idea.

Bouzid.

Depending on your use case, you could leave everything private and give the people you want to see the content "researcher" level user accounts. http://omeka.org/codex/Managing_Users_2.0

thanks mebrett.