/usr/share/igtf-policy/classic/DFN-GridGermany-Root.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
#
# @(#)1149214e.namespaces
# CA alias    : DFN-GridGermany-Root
#    subord_of: 
#    subjectDN: /C=DE/O=DFN-Verein/OU=DFN-PKI/CN=DFN-Verein PCA Grid - G01
#    hash     : 1149214e
#    (generated automatically from ./DFN/1149214e.signing_policy)
#
TO Issuer "/C=DE/O=DFN-Verein/OU=DFN-PKI/CN=DFN-Verein PCA Grid - G01" \
  PERMIT Subject "/C=DE/O=DFN-Verein/OU=DFN-PKI/CN=DFN-Verein Server CA Grid - G01"
TO Issuer "/C=DE/O=DFN-Verein/OU=DFN-PKI/CN=DFN-Verein PCA Grid - G01" \
  PERMIT Subject "/C=DE/O=DFN-Verein/OU=DFN-PKI/CN=DFN-Verein User CA Grid - G01"
TO Issuer "/C=DE/O=DFN-Verein/OU=DFN-PKI/CN=DFN-Verein PCA Grid - G01" \
  PERMIT Subject "/C=DE/O=GridGermany/.*"
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