> Now this is plainly false. I cannot start selling a Mickey Mouse JPEG stripped straight from Disney's site.
You can absolutely go to the Disney website right now, download any JPEG, convert that image to a series of 1s and 0s, and then print that series of 1s and 0s on a t-shirt that you sell on your website.
Once those 1s and 0s are in a new non-digital medium they are no longer a copy of the image. Historically, the digital copy is a special case because practically there is no difference between the "expression" of a byte sequence in a digital medium and the "idea" of a byte sequence in a digital medium.
A t-shirt is not a digital medium so the rights holders don’t get to extend their monopolization of speech to a screen print of an unintelligible pattern of 1s and 0s.