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Open data movement advocates support to public authorities by making available to society the public information they manage. The data released are identified as open government data and the creation of open data portals supports their commitment through open government policies. The worldwide increase of the open data publication is making more necessary the modelling of its impact on society. This research analyses the process of open data publication starting in the internal systems of the organization and reaching the actual reuse of data in reuser's ecosystem surrounding the open data portals. Different reuser's profiles are identified and described within the reuser's ecosystem. Some key elements of the publication process are presented in order to guarantee sustainability of open data initiatives and to further analyse the social and economic impact.

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