DETECTING CONTENT SCRAPING

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for identifying a plurality of n-grams in a plurality of resources found in a particular site; determining, for each of the plurality of resources, a count of n-grams that originated in the resource; determining, based on counts of n-grams that originated in the resources, a first aggregate count of n-grams that originated in the particular site; determining a second aggregate count of the plurality of n-grams that were identified in the plurality of resources found in the particular site; and determining, based on the first and second aggregate counts, a site originality score for the particular site.