/usr/share/acl2-6.3/books/arithmetic-3/pass1/ is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/arithmetic-3/pass1/basic-arithmetic-helper.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/basic-arithmetic.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/expt-helper.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/expt.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/inequalities.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/mini-theories.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/non-linear.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/num-and-denom-helper.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/numerator-and-denominator.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/prefer-times.cert
/usr/share/acl2-6.3/books/arithmetic-3/pass1/top.cert