I understand there's many around who are against negative/offensive SEO or if it's even possible. But let's leave the ethics and morals aside for this discussion. I'm just curious to find out various "de-ranking" attacks possible, to find ways to prevent/defend against it. If a content site were to have its contents(articles) copied and blasted onto a multitude of sites(via UD, AMR, SENuke, etc), will there be a penalty for duplicate content on the original site? If not, does that mean Google actually has a way to determine the "earliest" version of the content which was authentic and then subsequently decreases the ranking factors for the future articles/content? If so, doesn't that make any site very vulnerable to both content based attacks & also link spam? Just like how many would recommend against xrumer & scrapebox AA lists blasts to your money site, it makes me feel like its really tough to defend your site. So many manhours will be wasted just to disavow incoming link spams. What can a webmaster do against potential attacks?