[W]hile paper books might be harder to distribute, they have one huge advantage over ebooks: as long as an archivist or collector can keep them from falling apart, they’ll be as readable in a century as they will in a year. Keeping ebooks in the historical record is harder. How do you preserve something that can’t be locked in an archive, sold in a secondhand bookstore, or even converted to a new format without first navigating an arcane copyright system?