/usr/share/doc/libsscm3/changelog.Debian.gz is in libsscm3 0.8.5-4.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsscm3/../libgcroots0/changelog.Debian.gz
/usr/share/doc/libsscm3/../libgcroots0/changelog.Debian.gz