@InProceedings{	  hilty.ea:policy:2007,
  abstract	= {We present the Obligation Specification Language (OSL), a
		  policy language for distributed usage control. OSL supports
		  the formalization of a wide range of usage control
		  requirements. We also present translations between OSL and
		  two rights expression languages (RELs) from the DRM area.
		  These translations make it possible to use DRM mechanisms
		  to enforce OSL policies. Furthermore, the translations
		  enhance the interoperability of DRM mechanisms and allow us
		  to apply OSL-specific monitoring and analysis tools to the
		  RELs.},
  author	= {Manuel Hilty and Alexander Pretschner and David Basin and
		  Christian Schaefer and Thomas Walter},
  booktitle	= {12th European Symposium on Research in Computer Security
		  (ESORICS 2007)},
  copyright	= {Springer-Verlag 2007},
  editor	= {Joachim Biskup and Javier Lopez},
  pages		= {531--546},
  publisher	= {Springer-Verlag},
  series	= {LNCS},
  title		= {A Policy Language for Distributed Usage Control},
  url		= {http://www.springerlink.com/content/b18836662071k4j6/fulltext.pdf}
		  ,
  volume	= 4734,
  year		= 2007
}