No need to intrude into the transactions of others. If I sell you a Donald Duck baseball cap, claiming or implying that he's my original creation, I have defrauded you.
If, however, you want to buy one of my Donald Duck baseball caps, knowing full well that its a "counterfeit" copy made without permission of the original inventor/creator, then nobody should be interfering in our voluntary transaction.
Those who value inventiveness and creativity can buy solely from the product's originator, chasing for fraud anyone who falsely claims the title, and those who don't care don't have to.