en.wikipedia.org › wiki › Ebookebook - Wikipedia This e-reader, with expandable storage, could store up to 100,000 pages of content, including text, graphics and pictures. The Cybook is sold and manufactured at first by Cytale (1998–2003) and later by Bookeen. 1999. The NIST releases the Open eBook format based on XML to the public domain; most future e-book formats derive from Open eBook.