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Earwig's Copyvio Detector is a useful tool to help identify potential copyright/plagiarism issues. However, it is not foolproof: it frequently returns both false negatives (it misses some copyright issues) and false positives (it flags potential issues which are not actually problems). If you are reviewing an article for copyright and plagiarism, simply checking Earwig is not sufficient.
Here are some of the key issues, along with tips on how to account for them: