How to programmatically determine the uniqueness of the text in search engines?

Asked bydave lucas

I wonder how services like copyscape, antiplagiat.ru determine the uniqueness of the text?

Answers

dianne dohoney
Most likely, they are looking for similar documents. And if the text under study is very similar to a certain metric, it is considered a copy. Perhaps the same is done at the paragraph level.

How to find similar documents quickly - LSH (locality sensitive hashing) and clustering.
sandra kresal
Use shingly (shingle). That is, they take a randomly shingle from the text (usually they use shingles, I don’t remember exactly 5 to 9 words) and in quotes request it on a search. If the results are more than 1, then someone will scopipasti. And here the algorithm of the search engines themselves, by definition of the original, starts to work, and, moreover, the original source is not always correct.
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