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In this chapter, we will provide a brief introduction to the database-assisted dynamic spectrum sharing technology, including the network architecture, the regulatory and standardization status, and the associated technical and economic issues and challenges. We will review the current regulations of the UK and the US and illustrate how various network entities interact in such a database-assisted spectrum sharing network. We then outline the key technical and economic challenges of designing such a network. Finally, we provide an overview of the book, and suggestions regarding how to use this book for readers with different backgrounds and interests.