there are ways to do it
but program is not public.. it's being sold on darkweb and some forums
it exploits Widevine bug in chrome and allows user to save file in .raw format that needs to be converted to mp4/mkv
it's been a while since it's around and chrome is not doing much to fix it
more info
https://www.wired.com/2016/06/bug-ch...pirate-movies/