The CopySpider is a freeware tool to test documents under the existence criterion of undue copies of other documents available on the internet.
A document has copies undue when it suits or transcribed passages from other documents without showing compliance with the standard citation references (bibliography).
The CopySpider was designed to be nimble and precise in identifying similar documents available on the internet.
CopySpider has a Supporter license (provided as a reward for supporting the project) with resources focused on productivity evaluation of a large number of documents (batch processing).
The freeware version serves mainly students and their demands for certification. If you are interested in supporting CopySpider, access our project page on Apoia.se. About the features of each license, access https://copyspider.com.br/main/en/license