This book is a PhD thesis that was pioneering in several areas of security and privacy for Semantic Web and Linked Data. It shows that using these technologies, as any other Internet technologies, create not only exciting opportunities, but also new threats and risks. Studies presented in this book demonstrate how to mitigate and counter such threats and risks. Slawomir Grzonkowski is a researcher at the Digital Enterprise Research Institute (DERI), Galway, Ireland, where he received his PhD for his work on "A Privacy-enhanced Usage Control Model". He gained his experience while he was working on several research and commercialization projects such as CISCON, SeDiCi, eLITE or Lon. He conducted additional postdoctoral studies within the Semantic Group in CISCO Inc.