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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Replying to @David3141593
(sorry for noob question) So if I understand correctly, you need access to clear output? Hence it won't work when SW_SECURE_DECODE is enabled in the license?
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Replying to @phhusson
If it's using L3, this method always works.
5:35 AM - 3 Jan 2019
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