/usr/share/help/ca/rhythmbox/legal.xml is in rhythmbox-data 3.0.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/help/ca/rhythmbox/../../../help-langpack/ca/rhythmbox/legal.xml
/usr/share/help/ca/rhythmbox/../../../help-langpack/ca/rhythmbox/legal.xml