@InProceedings{	  dbsec13,
  title		= {{Unlinkable content playbacks in a multiparty DRM
		  system}},
  author	= {Ronald Petrlic AND Stephan Sekula},
  booktitle	= {{Data and Applications Security and Privacy XXVII}},
  year		= {2013},
  pages		= {289--296},
  publisher	= {Springer Berlin Heidelberg},
  abstract	= {We present a solution to the problem of privacy invasion
		  in a multiparty digital rights management scheme. (Roaming)
		  users buy content licenses from a content provider and
		  execute it at any nearby content distributor. Our approach,
		  which does not need any trusted third party - in contrast
		  to most related work on privacy-preserving DRM - is based
		  on a re-encryption scheme that runs on any mobile Android
		  device. Only a minor security-critical part needs to be
		  performed on the device's smartcard which could, for
		  instance, be a SIM card.}
}