The availability of data on the web and the improvement of technologies have made it increasingly easy to reuse existing data to create new databases and provide value-added services. Meanwhile, initial database creators have been seeking legal protection for their data. After presenting a brief history of legislation related to legal protection for non-copyrightable database contents, we discuss challenging issues to be considered in formulating a database protection regulation. These issues can be addressed from the perspective of economics. Results from a preliminary economic analysis are presented. The findings indicate that depending on investment required to create the initial database and the level of differentiation between the init...