[Zope] How to change permissions of ExtFile ??

I have created an interface for users to upload files to a zope server and everytime they upload the files I create an ExtFile to keep the file metadata. The problem is .. I want the files only to be accessible by Authenticated Users. How can I do this via a Python Script ? ( I Know how to do it manually using ZMI ) I want to do it dynamically using a python script. Thanks in advance -- Get your free email from www.linuxmail.org Powered by Outblaze