These sites are usually operated by spammers. They copy huge chunks of your content to their websites in order to direct the search traffic to their websites. Increased in traffic can help them make more money through advertising. Scrapper sites can be a real nuisance for webmasters.

Google's web spam leader Matt Cutts said the below in a recent tweet:

The link provide in his Tweet is to a form that lets web surfers report scraper pages to the Google guys.

All you are required to do is provide both yours and the other website's URL and any other additional details if required. The information you provide is likely to be used to test and improve Google's algorithm. However if you want to resolve this problem yourself you can do so too.

Get your fundamentals right!

To begin with ensure your website is being indexed on Google followed by checking if your new content too is being indexed by Google promptly. In addition to that also make sure you have a good number of backlinks, a regular flow of traffic, appropriate sitemaps, Robot.txt amongst other basics safeguarded.

Adhering to the above will prevent the Scraper site from being regarded as the "Original content" website. However if the imitating site get's indexed before yours does Google will see it first and regard it as the authenticate source. So get busy indexing!

All in all…

If you do not have your fundamentals in place start indexing and be a part of Google's experiment to find and fight the scraper websites .