"Things could have been different. Documentary films could have been
created the way books were, with writers using clips the way historians
use quotations (that is, with no permission at all).
And likewise,books could have been created differently: with each quotation licensed
by the original author, with the promise to ...use the quote only
according to the terms of a license.
All books could thus be today as documentary films are today--inaccessible. Or all documentary films today could be as almost all books are today--accessible." - Lawrence Lessig