@conference {inp:WuchnerMullerFischer2013, title = {{Compliance-Preserving Cloud Storage Federation Based on Data-Driven Usage Control}}, booktitle = {Proceedings of the 5th International Conference on Cloud Computing Technology and Science (CloudCom 2013)}, year = {2013}, author = {T. W{\"u}chner and S. M{\"u}ller and R. Fischer} }