The way I see it this is such a common problem that Google has to be able to handle it. Although they would *like* the "one url = one piece of information" idea to be real we and they know that in real life one piece of information may end up on many urls.
So they filter (as stated above) -- Our only concern as webmasters should be that we are not one of the ones filtered out. so using text that exists on another site is not wise, we are likely to be filtered out, but on our own sites? Who cares -- one of our pages will show, that'll do just fine for me.
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