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Demos are certainly NOT public domain, many of them carry copyright notices, for one thing. Distribution rights seem to vary from demo to demo, however.
YouTube, as it is, is clamping down on copyright violations, and things will only get 1000% worse for content creators as Article 13 comes into force (yes, it passed). It's a shame as Fair Use is a perfectly valid reason to use copyrighted material, and yet AFAIK Article 13 has gone against this principle in favour of memes and parodies, ironically.
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