An open source program with a copy protection scheme where in order to launch you must refer to your copy of the GPL and answer questions about it.

"What is the fifth word of GPLv3, '3. Protecting Users' Legal Rights From Anti-Circumvention Law.'?

* 'Granted'
* 'Work'
* 'Circumvention'
* 'Deemed'"

RMS: "You should have received a copy of the GNU General Public License along with this program." [Moving closer] "Did you?" [Moving closer still] "Did you REALLY?"
@mcc Alternate world in which widespread GPL adoption is contemporaneous with DOS shareware proliferation.
@xgranade i do sometimes wonder if there's a world where FreeDOS sees widespread adoption

@mcc I wonder similar with ReactOS. A part of me never really moved on from Windows 98 SE (to my discredit), and I sometimes wonder what a future in that sort of a UI model would look like.

(I guess Xfce, but I digress.)

I actually have one computer which came with FreeDOS pre-installed from the manufacturer. I did however reinstall the machine with Linux instead.
@kasperd @xgranade coulda played a few rounds of Scorched Earth first