/usr/share/igtf-policy/classic/GermanGrid.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
#
# @(#)dd4b34ea.namespaces
# CA alias    : GermanGrid
#    subord_of: 
#    subjectDN: /C=DE/O=GermanGrid/CN=GridKa-CA
#    hash     : dd4b34ea
#    (generated automatically from ./GermanGrid/dd4b34ea.signing_policy)
#
TO Issuer "/C=DE/O=GermanGrid/CN=GridKa-CA" \
  PERMIT Subject "/C=DE/O=GermanGrid/.*"
TO Issuer "/C=DE/O=GermanGrid/CN=GridKa-CA" \
  PERMIT Subject "/O=GermanGrid/OU=.*"
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