EUDAT aims to develop and support a Collaborative Data Infrastructure allowing researchers to share data across communities and carry out research effectively. EUDAT’s data services, like persistent storage, identification, authenticity, workflow execution and mining, can leverage cloud storage. But copyright or national law might not allow the data to leave the country or even the data centre in which they are curated. EUDAT takes a long-term view of the data it holds and is considering “trust marks” for digital archiving.