It is really interesting to look into the problem of software copyright and how you can really struggle trace the ownership and who owns what now.

For a video that's (surprisingly) closely related to the topic, see CGP Grey's video on the flag of Antarctica:

https://www.youtube.com/watch?v=U0wTDK0VOeY

(The most common flag used for Antarctica was created for the 3D World Atlas software, so presumably whoever owns the copyright to that software now, owns the copyright to the flag of Antarctica)