/usr/share/acl2-6.3/books/centaur/4v-sexpr/ is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/centaur/4v-sexpr/4v-logic.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/bitspecs.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/compose-sexpr.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/g-sexpr-eval.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/nsexprs.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/onehot-rewrite.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/portcullis.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-3v.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-advanced.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-building.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-equivs.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-eval.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-fixpoint-correct.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-fixpoint-rewriting.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-fixpoint-spec.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-fixpoint-top.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-fixpoint.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-loop-debug.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-rewrites.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-to-faig.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-vars-1pass.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/sexpr-vars.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/svarmap.cert
/usr/share/acl2-6.3/books/centaur/4v-sexpr/top.cert