/usr/share/doc/pd-csound/changelog.Debian.gz is in pd-csound 1:5.17.6~dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/pd-csound/../libcsound64-5.2/changelog.Debian.gz
/usr/share/doc/pd-csound/../libcsound64-5.2/changelog.Debian.gz