"There are very different laws about how companies in China can target children," Aynne Kokas, a professor of media studies at the University of Virginia and author of "Trafficking Data: How China ...

A version of this article appears in print on , Section B, Page 3 of the New York edition with the headline: TikTok’s Owner Already Publishes Digital Books. Now It Is Moving Into Print..

But ultimately, digital archives are harder to keep than physical archives, says Cushman. “If you run out of budget and leave books in a quiet, dark room for 10 years, they’re happy,” he says.