/usr/share/librecad/doc/LibreCADdoc.qch is in librecad-data 2.0.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/librecad/doc/../../doc/librecad/doc/LibreCADdoc.qch
/usr/share/librecad/doc/../../doc/librecad/doc/LibreCADdoc.qch