I happen to think copyright does induce creation and that creators and consumers as classes would worse off without it. And I think returning creative works to the commons in, say, 20 or 30 years also induces creation and that creators and consumers both are made worse off by longer copyright terms. That’s just a guess, but presumably there’s some vague fact of the matter about optimal terms for various types of creative work. Whatever that is, that’s what we’re entitled to. Extending terms past the optimum, locking down more than a lifetime flow of monopoly rents for a few at the expense of the many, doesn’t strike me as like theft. It’s a straightforward plundering of humankind’s common cultural inheritance.

Will Wilkinson, commenting on the Julian Sanchez post I just quoted.