Google has now announced that they will ban scraper sites permanently who copy content from other sites and paste it into their sites. Scraper sites are those sites who copy content from other sites or blog and post it on their sites to generate backlinks and content quality. Google used to get many complaints regarding content copying as copying this content will degrade the content quality of original source.
Google has released Scraper Report Form where webmaster can submit scraper site with source url where the content is copied and where the content is actually published and keywords list where scraper site is ranking. In this way Google will ban scraper site for years or permanently depending upon the quality of the website. But your website should follow the Google Webmaster Guidelines otherwise scraper site wouldn’t be banned.