There's an interesting copyright statement in this DIY Rietveld furniture guide that Artikel 16b of the Netherland's Auteurswet allows individuals to make personal copies of the designs for their own use, but not sell or transfer the physical chairs to others.
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I'm also not certain if I can allow anyone else to sit in my zelfgemaakt copy of Rietveld's Red/Blue chair.
@th haha thats amazing