In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.
(eg, price up, they will unload their product bit by bit, they want the best price as possible)
Why not follow institutions then? I know many people look at commercials data, not the institutions.