see previously discarded pull request #130
to continue the discussion on pull request #130 that was closed because the code got stale:
I had a look at django-guardian and django-permissions. They are both pretty cool projects and django-guardian seems to be very mature and well tested. The problem is, that both of the assume you attach a permissions to a single object. But we inherit permissions for files from the folder they are in. So that model sadly does not work for us.