Soooo, after a few evenings of work, I've 100% broken Widevine L3 DRM. Their Whitebox AES-128 implementation is vulnerable to the well-studied DFA attack, which can be used to recover the original key. Then you can decrypt the MPEG-CENC streams with plain old ffmpeg...
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I always thought they just pull the frames and/or waveform somewhere at driver lever. That way you avoid the hassle of always having to really break the DRM. Basically a) virtual machines exist and b) linux kernel is open source. hence all DRM is pointless.
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