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 # Widevine L3 Decryptor

-[Widevine](https://www.widevine.com/solutions/widevine-drm) is a Google-Owned DRM system that's in use by many popular streaming services (Netflix, Spotify, ...) to protect media contnet from being downloaded.

+[Widevine](https://www.widevine.com/solutions/widevine-drm) is a Google-owned DRM system that's in use by many popular streaming services (Netflix, Spotify, &c) to prevent media content from being downloaded.

 

 But Widevine's least secure security level, L3, as used in most browsers and PCs, is implemented 100% in software (i.e no hardware TEEs), thereby making it reversible and bypassable.

 

-This Chrome extension demonstates how it's possible to bypass Widevine DRM by hijacking calls to the browser's [Encrypted Media Extensions (EME)](https://www.html5rocks.com/en/tutorials/eme/basics/) and decrypting all Widevine content keys transferred - effectively turning it into a clearkey DRM.

+This Chrome extension demonstates how it's possible to bypass Widevine DRM by hijacking calls to the browser's [Encrypted Media Extensions (EME)](https://www.html5rocks.com/en/tutorials/eme/basics) and decrypting all Widevine content keys transferred - effectively turning it into a clearkey DRM.

 

 ## Usage

-To see this concept in action, just load the extnesion in developer mode and browse to any website that plays Widevine-protected content, such as https://bitmovin.com/demos/drm.

+To see this concept in action, just load the extension in Developer Mode and browse to any website that plays Widevine-protected content, such as https://bitmovin.com/demos/drm.

 

-Keys will be logged in plaintext to the javascript console:

+Keys will be logged in plaintext to the javascript console.

 

-`WidevineDecryptor: Found key: 100b6c20940f779a4589152b57d2dacb (KID=eb676abbcb345e96bbcf616630f1a3da)

-`

+e.g:

+

+```

+WidevineDecryptor: Found key: 100b6c20940f779a4589152b57d2dacb (KID=eb676abbcb345e96bbcf616630f1a3da)

+```

 

 Decrypting the media itself is then just a matter of using a tool that can decrypt MPEG-CENC streams, like `ffmpeg`. 

 

 e.g:

 

-`ffmpeg -decryption_key 100b6c20940f779a4589152b57d2dacb -i encrypted_media.mp4 -codec copy decrypted_media.mp4`

+```

+ffmpeg -decryption_key 100b6c20940f779a4589152b57d2dacb -i encrypted_media.mp4 -codec copy decrypted_media.mp4

+```

 

 ## How

 In the context of browsers the actual decryption of the media is usually done inside a proprietary binary (`widevinecdm.dll`, known as the Content Decryption Module or CDM) only after receiving the license from a license server with an encrypted key in it.

 

-This binary is usually heavily obfuscated and makes use of third-party solutions that claim to offer software "protection" such as [Arxan](https://digital.ai/application-protection) or [Whitecryption](https://www.intertrust.com/products/application-shielding/).

+This binary is usually heavily obfuscated and makes use of third-party solutions that claim to offer software "protection" such as [Arxan](https://digital.ai/application-protection) or [Whitecryption](https://www.intertrust.com/products/application-shielding).

 

 Some reversing job on that binary can then be done to extract the secret keys and mimic the key decryption algorithm from the license response.

 

@@ -30,5 +35,4 @@ Some reversing job on that binary can then be done to extract the secret keys an
 This PoC was done to further show that code obfuscation, anti-debugging tricks, whitebox cryptography algorithms and other methods of security-by-obscurity will eventually by defeated anyway, and are, in a way, pointless.

 

 ## Legal Desclaimer

-This is for educational purposes only. Downloading copyrighted matirials from streaming services may violate their Terms Of Service. Use at your own risk.

-

+This is for educational purposes only. Downloading copyrighted materials from streaming services may violate their Terms of Service. **Use at your own risk.**