This goes too far. Digital media are not only long series of numbers. They are often difficult-to-create expressions in image, video, and even interactive forms

This goes too far. Digital media are not only long series of numbers. They are often difficult-to-create expressions in image, video, and even interactive forms; regardless of their serialization format. Books are just strings of letters, yet copyright has still been useful to increase the volume and utility of books. All that said, I do find the life+70y an absurdly long time.