In fact there's no commercial requirement at all for copyright, abandoned or otherwise.
You can make a thing, copyright it, and also never sell, see for example open source software. You can even copyright something that nobody's seen before.
Copyright, patent, and trademark all have substantial differences.
You can make a thing, copyright it, and also never sell, see for example open source software. You can even copyright something that nobody's seen before.
Copyright, patent, and trademark all have substantial differences.