How to protect your invention when pitching it?

I recently saw this article that talks about how to protect your invention when you are thinking of pitching it to a company or an individual. It gives much of the same advice that I would give to a client. Such advice includes: consider filing a patent application (design or utility) prior to pitching your invention, get a confidentiality agreement signed by the party you are disclosing to prior to the pitch, and relying on copyright protection are some of the ways to protect your invention.