is to determine the original source for documents that are available on multiple URLs. Content duplication can happen in many ways, including:

* Duplication due to GET-parameters
* Duplication with multiple URLs due to CMS (i.e. www or non www urls)
* Duplication due to accessibility on different hosts/protocols. (i.e. https or http)
* Duplication due to print versions of websites

Duplicate content

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