This book throws a spotlight on innovation across the software universe, setting out key issues and highlighting policy perspectives. It spans research and development, invention, production, distribution and use of software in the market. It also covers core innovation themes from a user perspective -- including security and privacy, mobility, interoperability, accessibility and reliability. For more information about this book and other OECD work in this area, see www.oecd.org/sti/innovation/software. Innovation in the Software Sector is part of the OECD Innovation Strategy, a comprehensive policy strategy to harness innovation for stronger and more sustainable growth and development, and to address the key global challenges of the 21st century. For more information about the OECD Innovation Strategy, see www.oecd.org/innovation/strategy.