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We recommend using CC0 and adding a suggested citation because in most cases data (collection of facts) might not be eligible for copyright protection and ultimately creates an unnecessary barrier to re-use. For further reading see This post from the University of California’s Office of Scholarly Communication provides an overview of the situation and recommends the CC0 license for many kinds of data. The Open Database License (ODC-By) also has an attribution variant. See also our quick guide on licensing and data.