I believe that copyright notice is for organizing the layout of the actual distribution images (ISO, etc) and for the music and artwork (though work-for-hire), not that Theo de Raadt is claiming copyright over all of the code in the distribution.
I don't think they're claiming copyright; that's just a boilerplate statement alluding to the fact that just because you see it here on the public internet doesn't mean you shouldn't do your own research to find out whom if anyone has copyright.
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