/usr/share/igtf-policy/classic/MREN-CA.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
#
# @(#)3232b9bc.signing_policy.namespaces
# CA alias : MREN-CA
# subord_of:
# subjectDN: /DC=me/DC=ac/DC=MREN/CN=MREN-CA
# hash : 3232b9bc
# (generated automatically from 3232b9bc.signing_policy)
#
TO Issuer "/DC=me/DC=ac/DC=MREN/CN=MREN-CA" \
PERMIT Subject "/DC=me/DC=ac/DC=MREN/.*"
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