If you were attacked by pirates, who would you want by your side? A loyal horde of head bangers, gangstas and hard-core punks? Or a brainy clutch of bookish types? I'd generally advise you to go with the former group. But it turns out that in the swashbuckling arena of digital piracy, the publishing world is acquitting itself far better than the brash music industry.

Ten years ago this Sunday, the record labels thought they had turned the tide against piracy when the wildly popular Napster—a service that allowed anyone to...