Of course, the ways in which our rights get chipped away as we move away from analog content is a constant worry in the digital age. I’m not the first pundit to note how terrible it is that we can no longer share, resell, or modify the books, movies, and video games that we get over the Internet. But the sharing restrictions that publishers have placed on e-books strike me as particularly stringent, a rule that underlines how we’ll mourn physical media when it goes away. Under Amazon’s and Barnes & Noble’s sharing model, you’re allowed to loan out a book just once, for two weeks, and while it’s loaned out, you don’t have access to it. The fact that publishers can’t stomach even this milquetoast model should have us scared for a future in which physical media loses its primacy.