/usr/share/igtf-policy/slcs/4b2783ac.namespaces is in igtf-policy-slcs 1.88-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/igtf-policy/slcs/PSC-Myproxy-CA.namespaces
/usr/share/igtf-policy/slcs/PSC-Myproxy-CA.namespaces