Manufacturer Authorization
Any reputable manufacturer will want to know that you in fact own the product (or at least licensed the rights). They're not going to manufacture anything until you prove you have the rights. Which is a good thing. I don't want someone calling LongPack and ordering 10k units of Plunder without my permission. So before production begins you'll need to show your copyright or trademark. You might also need to create and sign a contract proving you are the owner. I've included an example: