/usr/share/acl2-6.3/books/fix-cert/ is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/fix-cert/fix-cert.cert
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert0.cert
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert1.cert
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert2.cert
/usr/share/acl2-6.3/books/fix-cert/test1.cert
/usr/share/acl2-6.3/books/fix-cert/test1b.cert
/usr/share/acl2-6.3/books/fix-cert/test1bb.cert
/usr/share/acl2-6.3/books/fix-cert/test1bp.cert
/usr/share/acl2-6.3/books/fix-cert/test1p.cert
/usr/share/acl2-6.3/books/fix-cert/test1pb.cert
/usr/share/acl2-6.3/books/fix-cert/test1pp.cert
/usr/share/acl2-6.3/books/fix-cert/test2.cert