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That's because works created by the US Government are public domain (at least within the US). https://en.wikipedia.org/wiki/Copyright_status_of_works_by_the_fe

• tpmx 3y ago
  That makes so much sense. I wish the EU (and/or European countries in general) would enact something similar but I think may be too late to do the same here now. Way too many stupid little fiefdoms "owned" by socially powerful people with short-sighted self interests. The US did it in 1895 before the massive expansion of that particular social class. Smart. (I guess a similar social class is doing very well in "non-profits" in the US these days, instead.)
• orbital-decay 3y ago
  Scientific datasets from unique projects are typically embargoed for several months, to give the participating scientists time to publish. This is also true for the US.