Restricting rights on opendocument.xml.org

Hi,

it's been one week since I'm trying to hunt blog spammers in our blog
section of opendocument.xml.org . Almost everyday I erase blogs that are
obvious spams, and their authors. But they keep coming back. Two of
these blogs cannot be erased by the way. Could restrict the posting
rights for the blogs' section to the site editors only?

Thank you,

-- 
Charles-H. Schulz,
Associé / Associate
Ars Aperta.