[Zope] Only allowing authenticated users to view document

I have a dtml-document which I wish to be viewed only by (certain) authenticated users. I tried un-checking all the security permissions and the acquire permissions boxes, but I can still access the method. Putting a <dtml-var AUTHENTICATED_USER> in the form shows nothing when I test it (and not anonymous as I thought it would). Any help getting this to work would be apprectiated....