This paper describes document delivery services on digital library systems, focusing on the electronic delivery service of scientific research papers and articles. Some operational delivery services are described. The term “electronic document delivery” actually covers broader applications relating to electronic publishing which became a reality after the advent of the Internet and the World Wide Web. The arrangements of the social/economic system for electronic publishing, however, are still undetermined and the copyright issues and the use charges for electronic document delivery services are an open question. This paper addresses these issues, too. Commonly used World Wide Web browsers are not ideal tools for document delivery and their shortcomings are discussed to develop future document delivery systems.