Philosophy and practice of open data pursue the openness of certain data, especially from governments and public bodies, for all citizens. Finally, these vindications have get the implementation of several transparency lesser laws. Once get to convince certain Public Administrations to free some data and facilitate their access emerge questions about their scope, utility of the data or the existence of public and reserved information. Are enough these transparency laws? What utility have the opened data for a effective government control by citizens? To what extent must maintain some data confidential?Are the leaks of information classified as secret in certain cases (wikileaks, Snowden, Falcini …) are legitimate? Can help digital networks to citizenship to control their governments or only serve to surveillance?

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