[zozbot234]

Copyright covers expression, not ideas. The underlying problem here is that Ross Intelligence never went to the trouble of distilling the purely idea-based and factual element from their original sources; even their finalized search system still had a pervasive reliance on Westlaw's original and creative expression as embedded in their headnotes. Using Windows and then creating Linux is something entirely different because Linux goes to great effort in order not to use anything that's specific to Windows. Large-scale language models are probably somewhere in the middle, because their unique reliance on an incredibly wide variety of published texts makes it very unlikely that they'll ever preserve anything of substance about the expression in any single text.