/usr/share/igtf-policy/classic/DigiCertGridCA-1-Classic.signing_policy is in igtf-policy-classic 1.79-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # DigiCert Grid CA-1 Signing Policy
access_id_CA X509 '/DC=com/DC=DigiCert-Grid/O=DigiCert Grid/CN=DigiCert Grid CA-1'
pos_rights globus CA:sign
cond_subjects globus '"/DC=com/DC=DigiCert-Grid/*" "/DC=com/DC=DigiCertGrid/*" "/C=US/O=DigiCert Grid/*"'
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