Copyright for grub-installer source package in Stretch
This package is under the GNU GPL version 2, or any later
version at your option.
On Debian system, the GPL is available in
/usr/share/common-licenses/GPL-2
This package is under the GNU GPL version 2, or any later
version at your option.
On Debian system, the GPL is available in
/usr/share/common-licenses/GPL-2