The question of reinforcing and/or undermining the principle of Freedom of Information depends wholly on what your data is depicting. If your data/map/application is simply providing information regarding public parks, utilities, etc. there is very little to mask in the way of information. On the other hand, if your data/map/application is dealing directly with personal information or data that could be considered 'sensitive' in a security perspective that is a completely different matter all together.
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