Exactly how does that audit work? Can you tell us based on your friend's?If your data is coming from a broker like Lightspeed with an integrated data/order API, then you can expect an audit if you declare display and are pulling/executing via API. If you don't mind going through an audit process and have nothing to hide, then it should be fine.
Before you say, not gonna happen, I have a friend who was audited by NYSE recently from pulling data from a data vendor with NO broker connection. They're getting WAY more strict about this.
"What do you do with the data?"
"I chart it. Here is the program I use."
"Then what do you do?"
"Then I submit the orders. Manually. Type them in and send them. Here is the program I use."
.... ?