Question, in case someone has some experience on this. Suppose I would want to create a web service / mobile app which would offer trade advice (indicators) based on a subscription fee. The indicators would be calculated using realtime and / or historical market data, both stocks and options. IANAL but I think this falls under "derived data license" with respect to that marketdata I'm using. So if I purchase the data for use by myself, can I sell data derived from the original market data without signing additional licenses and paying additional fees? (100% that I can't but asking anyways). Otherwise anyone has any experience with this sort of thing and idea how much would it cost?