Google’s John Mueller answered a question about how Google handles copied content. Mueller’s answer covered different kinds of duplicate content. He ended his response with an observation about the original source of content and relevance.
The person asking the question wanted to know how Google determined which content is the original source and which content copied.
John Mueller gave a broad answer that used different kinds of copied content as examples (like boilerplate content used across an entire website).
This approach had the effect of giving a rounded overview of the different kinds of copied content that Google has to deal with.
In the following passage the audio is garbled, that’s why some of the quote is in parentheses, as that’s my estimation of what Mueller said.
John Mueller addressed authorship of content, particularly in the difficulty of identifying who is the primary author.