Abstract-The use of data Grids for sharing relevant data has proven to be successful in many research disciplines. However, the use of these environments when personal data is involved (such in health) is reduced due to its lack of trust. There are many approaches that provide encrypted storages and key shares to prevent the access from unauthorized users. However, these approaches are additional layers which should be managed along with the authorization policies. We present in this paper a privacy enhancing technique that uses encryption and relates to the structure of the data and their organizations, providing a natural way to propagate authorization and also a framework that fits with many use cases. The article describes the architecture and processes and also shows results obtained in a medical imaging platform.