/usr/lib/python2.7/dist-packages/arcom/store/cachedpicklestore.py is in nordugrid-arc-python 1.1.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/arcom/store/../../../../../share/pyshared/arcom/store/cachedpicklestore.py