Mine Netflix app data?

My friend recently talked about mining the app data from netflix, and if so how

Please mine?

The app data if you download a video from Netflix it is encrypted and my friend told me that you would have to mine the app data to decrypt it and get it in mp4 format

The video feed is particularly protected. With HDCP.

From the system to the screen.
You can certainly decrypt or bypass it, but crack it. Ne.
Too expensive

MP4 is just a container.