/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/ is in erlang-percept 1:17.3-dfsg-4+deb8u2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/conf/
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/conf/mime.types
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/css/
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/css/percept.css
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/htdocs/
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/htdocs/index.html
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/images/
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/images/nav.png
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/images/white.png
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/scripts/
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/scripts/percept_area_select.js
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/scripts/percept_error_handler.js
/usr/lib/erlang/lib/percept-0.8.9/priv/server_root/scripts/percept_select_all.js