In the physical realm, that doctrine held that while a person couldn’t, say, replicate a copyrighted text and publish new copies of it without copyright owners granting them a license to do so, they could resell a book in which that text appears, transferring total control and ownership to a new owner. Thus, the doctrine distinguishes between the copyright attached to a digital work and the vessel, such as book or record, in which works drawn from that copyright reside.