/usr/share/igtf-policy/classic/PK-Grid-2007.namespaces is in igtf-policy-classic 1.88-1.
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
#
# @(#)f5ead794.namespaces
# CA alias    : PK-Grid-2007
#    subord_of: 
#    subjectDN: /C=PK/O=NCP/CN=PK-GRID-CA
#    hash     : f5ead794
#    (generated automatically from f5ead794.signing_policy)
#
TO Issuer "/C=PK/O=NCP/CN=PK-GRID-CA" \
  PERMIT Subject "/C=PK/.*"
 |