Most of B2B Portals are running same content in products description / Classifieds and have top ranking and all content is match by client Website, but google does not penalize... compare both url www.kummarstamping.com and http://www.indiamart.com/kps-pvtltd/ on Indiamart link all content is copy from kummarstamping.com but both page have ranking in top 10 when m searching "Kumar stamping" what is the reason ?
The first url doesn't work. Google doesn't penalise fro dup content, they just remove it from the SERPs. Or at least they try. They're not infallible though and some dup content remains.
google does not punish duplicate content, they just filter. So, higher rank/seo wins. For copyright issue, copyright holder have to complain to them