[Zope] Help: mod_python+ZPublisher and authentication

Hello, This is not exactly a Zope question, but I hope that some of you will be able to help me: I am using mod_python + ZPublisher + Ztemplate on a apache server and now I would like to restrict the access of some pages served by the ZHandler.py. How to do it?? Do I have to put a rewrite rule in apache? The Zhandler.py seams to reply all the time a 200 code to apache, do I have to modify it to send back an 'Unauthorized' code??( I don't know how to raise the 'Unauthorized' error from the python module I am publishing) Thanks for any help Gilles Lavaux