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HOW? There's no original content whatsoever. Truly. Where's the "duplicate content penalty" that they all speak of?
There is no real duplicate "penalty" just for reprinting information - but there is a filter to make sure that Google users don't get ten choices that all lead to different copies of the same thing. If a site has aggregated lots of useful information in one place, then that service of aggregating can attract the natural links that help it to be one of sites that is not filtered out on a relevant search.
So it really is about relevant backlinks, then... isn't it?