The National Technical Library in Prague (Czech abbrev. NTK) offers a new service called eBooks on Demand (EOD). Its aim is a digitisation on demand of NTK‘s historical collection of books. Through the EOD service customers can order public domain books for digitisation and an electronic copy of a book is then delivered to them. Later on, NTK stores this eBook copy in the Digital National Technical Library and thus offers it to other interested customers for free. This article introduces the EOD service and its implementation in the NTK.