/usr/share/doc/csound/changelog.Debian.gz is in csound 1:6.02~dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/csound/../libcsound64-6.0/changelog.Debian.gz
/usr/share/doc/csound/../libcsound64-6.0/changelog.Debian.gz