Copyscape is an online service which simply detects web plagiarism. It can find all online copies of textual content but not of images or other media. If someone copied textual content of your website, Google can mistakenly mark just yours as duplicate contents.
Google filters out duplicate pages, and only shows one page with given set of content in its search results. Google strictly penalizes all websites which contain large amounts of duplicate contents.
Copyscape is powerful webservice that protect your content against online plagiarism and theft. It’s powered by Google Web API for its searches.
