Right, but information available to those with a confidentiality obligation can still be traded on if acquired legally. That's the crucial point. It's not enough for it to be non-public and material, you must also be in breach of a fiduciary duty (or acting in concert with somebody who is). For example, if a Boeing CEO was at a coffee shop discussing an upcoming acquisition at the table next to you, you'd be able to trade on it, even though it was confidential information not available to the general public and obviously material to Boeing's stock price.