/usr/share/doc/gssdp-tools/README is in gssdp-tools 0.14.14-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gssdp-tools/../libgssdp-1.0-3/README
/usr/share/doc/gssdp-tools/../libgssdp-1.0-3/README