Imagine the following situation: you are trading a profitable system using a popular futures contract as the instrument. The system has a long run profit factor of about 2.5 and produces both a volume and size of trades that makes it a big long term winner. The system is 100% automated. The system is fairly simple - any intelligent person looking at a list of the time, order type and price of your trades and comparing it to charts of the data feeds you had requested could, with a population of about 2 week's trades, figure out what the system was. They might not discover all the details, but more than enough to steal the system or manipulate price to screw with you. Now, here's the question: what is the probability of this happening at a retail brokerage. Does it vary by broker? Let's assume that by virtue of trading this system the growth in your account will be notable. You will also be generating some good commissions for your broker as your account grows, so there's an incentive not to screw with you. If you think the probability of trouble is high, how would you go about covering your tracks? Responses by people with actual inside knowledge of brokerage operations are obviously more valuable than rants.