Abstract
There is a range of reasons for securing data and systems, from those already common nowadays (IPR, licenses, privacy, confidentiality, etc.) to others likely to appear in the future (distributed trust, reputation building, social collaboration, etc.). The systems need to manage the data according to these restrictions while maintaining other requirements for data infrastructures (e.g., scalability, interoperability, provenance), and also the systems themselves need to be secured against potential external attacks.