Harry Blackmun,
Sony Corp. of America v. Universal City Studios…
“ When the ordinary user decides that the owner’s price is too high, and forgoes use of the work, only the individual is the loser. When the scholar forgoes the use of a prior work, not only does his own work suffer, but the public is deprived of his contribution to knowledge. The scholar’s work, in other words, produces external benefits from which everyone profits. In such a case, the fair use doctrine acts as a form of subsidy—albeit at the first author’s expense—to permit the second author to make limited use of the first author’s work for the public good. ”
