Denis Zwirn is the founder of Numilog, the main French-language digital bookstore. He wrote in August 2007: "The digital book is not any more a topic for symposiums, conceptual definitions, or divination by some 'experts'. It is a commercial product and a tool for reading. There is no need to wait for some new hypermodern and hypertextual tool carefully orchestrating its specificity from the print book. We need to offer books that can be easily read on any electronic device used by customers, sooner or later with an electronic ink display. And to offer them as an industry. The digital book is not, and will never be, a niche product (dictionaries, travel guides, books for the blind). It is becoming a mass market product, with multiple forms, like the traditional book." After being a journalist specialized in publishing, multimedia and copyright, Marc Autret is a graphic designer working with publishers. He wrote in December 2006: "I am convinced that the ebook has a great future in all non-fiction sectors. I refer to the ebook as a software and not as a dedicated physical medium (the conjecture is more uncertain on this point). The [European] publishers of guides, encyclopedias and informative books in general still see the ebook as a very minor variation of the printed book, probably because the business model and secure management don't seem entirely stabilized. But this is a matter of time. Non-commercial ebooks are already emerging everywhere while opening the way to new developments. To my eyes, there are at least two emerging trends: (a) an increasingly attractive and functional interface for reading/consultation (navigation, searching, restructuring on the fly, annotations of the user, interactive quiz); (b) a multimedia integration (video, sound, animated graphics, database) now strongly coupled to the web. No physical book offers such features. So I imagine the ebook of the future as a kind of wiki crystallized and packaged in a given format. How valuable will it be? Its value will be the one of a book: the unity and quality of editorial work!" Marc was not happy about the “competition” between PDF and EPUB. He added in June 2011: “I do regret that the emergence of EPUB has led to the outright annihilation of PDF as a format for digital books. The fact that interactivity elements available within the PDF are not supported by the current mobile platforms has removed any possibility of experimenting new things in this direction, that had seemed very promising to me. While print publishing gives place to many different objects, ranging from the carefully designed art book to the basic book for everyday reading, the ebook market has grown from the start on a totalitarian and segregationist mode, comparable to a war between operating systems, rather than favoring a technical and cultural emulation. Because of this, there are few PDF digital books benefiting from the opportunities given by this format.