/usr/share/igtf-policy/classic/SlovakGrid.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
#
# @(#)e13e0fcf.namespaces
# CA alias    : SlovakGrid
#    subord_of: 
#    subjectDN: /C=SK/O=SlovakGrid/CN=SlovakGrid CA
#    hash     : e13e0fcf
#    (generated automatically from ./SlovakGrid/e13e0fcf.signing_policy)
#
TO Issuer "/C=SK/O=SlovakGrid/CN=SlovakGrid CA" \
  PERMIT Subject "/C=SK/O=SlovakGrid/.*"
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