@conference{EURECOM+3697,
  author = {Cutillo, Leucio Antonio and  Molva, Refik and  Önen, Melek},
  title = {Privacy preserving picture sharing : Enforcing usage control in distributed on-line social networks},
  booktitle = {SNS 2012, 5th ACM Workshop on Social Network Systems, April 10, 2012, Bern, Switzerland},
  year = {2012},
  editor = {ACM},
  address = {Bern},
  note = {© ACM, 2012. This is the author\&\#039;s version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in SNS 2012, 5th ACM Workshop on Social Network Systems, April 10, 2012, Bern, Switzerland http://dx.doi.org/10.1145/2181176.2181182},
}