/usr/share/doc/gap-scscp/demo is in gap-scscp 2.1.4+ds-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gap-scscp/../../gap/pkg/scscp/demo
/usr/share/doc/gap-scscp/../../gap/pkg/scscp/demo