The author of App Store Confidential says he is “surprised” by Apple’s attempt to halt sales of the book, and by the company’s allegations that the German-language memoir reveals trade secrets.

Tom Sadowski, a former App Store manager who worked at Apple from 2009 through 2019, told Cult of Mac he’s not sure which parts of his new book Cupertino objects to. “I’d love to [know], but unfortunately I don’t,” he said. “I am accused of betrayal of secrets without specifying it more precisely.”

Apple is suing former German App Store manager Tom Sadowski and his publisher over App Store Confidential, a new book that reveals “business secrets” Apple says Sadowski wasn’t legally allowed to disclose.

Cupertino’s lawyers are asking Sadowski and publisher Murmann Verlag to destroy all manuscripts of the German-language book, and to recall any copies currently in circulation. Apple says the book contains information that is of “considerable economic value” to the company.