Again, if you are in SEO you should be making yourself aware of these things, and the best source by far and away is
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A Google patent discusses how a site might be labeled a low quality site by Google based upon the links from other pages pointed to the site, and how this can potentially reduce rankings for a page.
How Google May Classify Sites as Low Quality Sites
A Google patent describes how it may assign a site a low quality score based upon the links pointed to the site; such as links from boilerplate or multiple redundant resources on a site.