[Zope] Suppress evaluation of dtml?

Hello, I have a site where people can upload arbitrary html to view it. I do not want these users to be able to execute dtml. I have turned off all permissions for the anonymous users except for view and access contents, but dtml is still evaluated in these html files. Is it possible to suppress all evaluation of content and just act as a web server for certain areas or for certain files? Thnx, VanL