[xwiki-users] Can't disable registration in version 2.2

Hi everybody I'm using XWiki Enterprise, version 2.2.6.28645, out of the box with the HSQLDB. I've enabled LDAP authentication, and I want it to be the only means for a user to edit content in the Wiki. Therefore, I want to disable the "Register" link, so that users that are not in the LDAP can't register themselves. I've already removed the "Register" right from XWikiAllGroup, but the "Register" link is still there and everybody can use it. Is there another approach for this? I can't find any useful information in the documentation regarding this.