WideVine WebKit Debian

I am building a media player app. Based on HTMLViewer/WebKit.
(This is home automation hobby work. The plan is to make it open source if the proof of concept works)
When faking the agent with agent = “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15”, it runs Spotify and Netflix as expected on the development Mac.
But I can not get it working on Debian based Linux (x86 64-bit nor ARM 32-bit)
I know the cause is WidevineDRM support.
Who knows how the widevine dependencies on Debian work for WebKit?

To be clear, are you trying to circumvent DRM protections?

No. Not.
I try to get HTML5 with DRM working in WebKit.

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