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> But there's also the first sale doctrine--that after you sell your physical product, people can do with it as they please, including resell.

Yep! First sale doctrine applies to all transactions. This is why my gammy can resell her Oxy’s and it’s all nice and legal.

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To speak more precisely, the first sale doctrines prevent the original seller from asserting intellectual property rights (copyright, patent, trademark) as a basis to prohibit resell. I was writing an internet comment, not a legal brief!

So then first sale has nothing to do with Doordash’s food delivery service right?

It's an obstacle to suing Doordash for trademark infringement, which is what you would typically do when someone is doing business in your name without your permission.

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