Thread:Project:Support desk/Limiting the ability to view a namespace

I found in your manual that I can forbid certain usergroups from editing certain namespaces, and I forbid a usergroup from seeing pages not on their whitelist. Is it also possible to only allow certain usergroups to see ceratin namespaces? Specifically, I want (1) anonimous readers to only see the main page and login page, (2) logged-in users to see and edit everything except the Premium_content namespace, and (3) the premium usergroup to be able to see and edit everything. Thank you.