racked parent
Widevine video encryption really kicked my ass the other day. It's supposed to be bypassable but I've yet to find a practical option that doesn't require hours of fiddling.
you can use https://cdm-project.com/Android-Tools/dumper-diazole.git
it uses frida to make dumping l3 keys really easy (start frida, run the script, open firefox, visit a test DRM page, profit??)
If you're happy with 480p.