Recently I came across a question that in order to answer accurately would have required using a substantial amount of technical information which is copyrighted. There is an official website for such information and that website also is copyrighted.
Now the question was good and there was a valid answer, but that answer was to the effect of "Please see the official website because due to copyright restrictions we cannot provide the details on Stack Exchange." That answer was voted down.
Are we forbidden from providing the best and only possible answer if that answer is just a link? I am not talking about linking to an illegal copy, but rather linking to a legal (official) source of copyrighted information which Stack Exchange cannot legally replicate on-site.
While I am trying to keep this Question at the generalized policy level, the question I'm referring to asks for a formula. The answer requires replicating an extensive set of data tables located across several pages of a website, where every page bears a copyright notice. I linked to that website, but my answer was deleted. There's another answer that I think is worse than mine; it was accepted, while mine was deleted.