do they know the source ? yes and no. They have the ability to check it in most cases , you also have the ability to hide it or trick google if you really want.
serp is like regular content, two sites can have the same content/video and both rank , and the "copy"site can outrank the content holder if it is more relevant , it could also get "duplicate content penalty" if done wrong.
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hatisblack at yahoo.com
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