/usr/lib/x86_64-linux-gnu/libCDApplet.so.1 is in cairo-dock-dbus-plug-in-interface-vala 3.4.1-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libCDApplet.so.1.0.0
/usr/lib/x86_64-linux-gnu/libCDApplet.so.1.0.0