/usr/share/igtf-policy/classic/CALG.namespaces is in igtf-policy-classic 1.59-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#NAMESPACES-VERSION: 1.0
#
# @(#)742edd45.signing_policy.namespaces
# CA alias : CALG
# subord_of:
# subjectDN: /DC=LV/DC=latgrid/CN=Certification Authority for Latvian Grid
# hash : 742edd45
# (generated automatically from 742edd45.signing_policy)
#
TO Issuer "/DC=LV/DC=latgrid/CN=Certification Authority for Latvian Grid" \
PERMIT Subject "/DC=LV/DC=latgrid/.*"
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