Isn't plagiarism inherently unauthorized?

If we go by the dictionary definition "Plagiarism means using someone else’s work without giving them proper credit" then I'll bet in art authorized plagiarism has historically been a common occurrence, for example.

	▲	echoangle an hour ago \| parent [-]
		If it's authorized, I would argue that the credit you give is the proper credit, even if it is nothing at all. If you ask me if you can reproduce my works without giving credit and I say yes, I don't think you're using my work without giving proper credit.

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hoppyhoppy2 2 hours ago | parent | prev [-]

If I let my buddy copy my essay, he would be committing authorized plagiarism, right ? It still fits the dictionary definition of plagiarism, and it's also authorized (by me, anyway)