[Zope] grufspaces, scripts and inherited permissions

Hello everybody, I created a group member and a group folder (using grufspaces), from where I run a python script. The result of this script is a n number of brain objects (indexed_file) indexed in portal_catalog. All object are correctly indexed, so I can search contents, but as a groupmember only. the question is: how can I modify (from the script) permissions of the brains objects in order to get them searchable from anybody? the main part of my script: for pub in context.query_05(idx_value=idx_value): object = '/query_06/' + pub.id + '/indexed_file' my_catalog.catalog_object(pub, object) thanks! Stefano