[Consortium] wiki.LAO - lockdown to registered users

Hi all, http://wiki.linuxaudio.org is seeing an increasing amount of SPAM. For a while it has been sufficient to [fail2]ban IP addresses that incorrectly guess CAPTCHA - ie. prevent brute-force attacks and manually revert the remaining pollution. -- Yet in the last months either CAPTCHA breaking has improved or there are real persons doing the spamming. I did not do statistics, but from watching the changelog I gather that the vast majority of contributions to the wiki comes from registered users. So the idea is to lock the wiki down and only allow registered users (registration requires an email address) to edit it. Thoughts? Objections? robin