/usr/share/doc/globus-gass-copy-progs/changelog.Debian.gz is in globus-gass-copy-progs 8.6-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/globus-gass-copy-progs/../libglobus-gass-copy2/changelog.Debian.gz