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Source: https://writers.stackexchange.com/a/7550
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Plagiarism is an ethical concept, not a legal one, so there is no universal accepted standard. The 'five-consecutive word' is a rule of thumb, not a legal precept. If you are writing for a particular forum, they may have anti-plagiarism guidelines. This is universally true for universities and other educational institutions, you should check your student handbook if this applies to you. These sorts of institutions actually have software comparing student work to other sources, giving details on the points of comparison.

Quotes, properly attributed, are always allowable within reason (you can't "quote" the entire New York Times on your blog without running into legal trouble). Cliches are typically quotes that have lost their attribution through long use (although your 'My country, right or wrong' is part of a longer Stephen Decatur statement). Cliches are generally open for use, but are also boring and lazy writing.

Otherwise, use your best judgment. If you're actually to the point of counting individual words in common, my guess is that your writing is too close to the original. And no fair changing up one or two words or just changing the word order slightly. It's unethical and, possibly more to the point, doesn't work.

Original score: 4