When you are duplicating the content on to your site, you are violating content copyright policy. Search engines are always against duplicate content on the site. Penalization of ranking loss and page rank loss is the ultimate result of going against content copyright policy. And probably you will be victimized in content copyright penalty. If your site is new and you are going against content copyright, it will be nearly impossible to rank on major search engines. SO never ever go against content copyright. Such that you never fall under content copyright penalty.

Basically 3 sites of sites goes against content copyright policy, once a new site uses the duplicate content, another an affiliate site uses duplicate content and same kind of sites to promote there products. And lastly a site only developed to cater 3rd party content on there site. These all 3 kind of sites fall under content copyright penalty. So never use duplicate content to be penalized. Go with the content copyright policy and make your site rank higher on the search engines.