That is a good idea if you never plan to work for a company involved in development and production of new technologies or consumer goods. If you go to work for any major manufacturer or product development company, an intellectual property agreement will be one of the documents you must sign if you want them to pay you for working there.
If they want you, they will amend the agreement. If not, then you’re not an employee, you’re a slave. That explains the quality of a lot of television - slave labor at its finest. What really puzzles me is how they got this under copyright law. It’s almost unenforceable. Trademark is much better protection. I’m wondering how Mattel managed to have this as a copyright case. Perhaps they made a little goof in their agreements. Considering the money at stake, I’d expect an appeal, and I’d expect Mattel to lose the appeal rather broadly.