The document summarizes a study conducted by TNO for the Dutch Ministry of Interior on open data policies in six countries. It finds that while many agencies hesitate to adopt open data policies, strategies in frontier countries focus on public services and democracy. Countries implement policies through a mix of voluntary and mandatory approaches like guidelines, legislation, and economic incentives. The top drivers of open data include strategies in other countries and political leadership, while barriers include closed government culture and privacy concerns. Potential effects are economic, more efficient government, and increased democracy, but more empirical evidence is still needed.