/usr/share/doc/libhd-dev/README-legacy.md is in libhd-dev 21.23-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libhd-dev/../libhd21/README-legacy.md
/usr/share/doc/libhd-dev/../libhd21/README-legacy.md