how to developing “document plagiarism checker” website in asp.net?

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i know this website write-check

his functionality is uploading a file(PDF,Doc) and check percentage of redundancy between the file uploaded and a lot of websites ,books,researches and after user upload file and result shows that result show redundancy percentage and highlight on copied paragraphs . that paragraphs were repeated in website references when user hover on these highlights the source or references appear to the user to make sure the source he copied from

this is explain simply for website functionality can any one help me in analysis for asp.net website has the same functionality and how check between uploaded file and archived files

Posted 11-Nov-12 0:54am

nagiub2007

Updated 11-Nov-12 6:19am

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Richard MacCutchan 11-Nov-12 7:09am

Text analysis is a whole art/science. Try searching Google for information on this.

Sergey Alexandrovich Kryukov 11-Nov-12 22:45pm

Exactly. Actually, I don't believe such tool can be developed and made universal, on the present level of computer science. If you simply check of exact matched in some big fragment of text, it will to make too many false negatives and false positives.
--SA

nagiub2007 12-Nov-12 3:41am

i can't understand clearly can u explain more with examples plz

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