Most (if not all) interactive charts do all their work in the browser, and never send any data back to Google. IIRC, the image charts are processed by Google, though, so you'd probably want to stay away from them. You can check the data policy for each individual chart to be certain: for example, interactive bar charts: http://code.google.com/apis/visualization/documentation/gallery/barchart.html#Data_Policy
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