/usr/share/acl2-6.3/books/misc/dft-ex.acl2 is in acl2-books-source 6.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ; cert-flags: ? t :defaxioms-okp t
(certify-book "dft-ex" ? t :defaxioms-okp t)
|