@inbook{JM07,
  author	= "H.L. Jonker and S. Mauw",
  title		= "Core security requirements of {DRM} systems",
  booktitle	= "Digital Rights Management -- An Introduction",
  editor	= "D. Satish",
  pages		= "73--90",
  publisher	= "ICFAI University Press",
  ISBN		= "81-314-0792-6",
  year		= "2007"

}