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Introducing Chrome CDM Decryptor 
What the hell is this?
• This is a widevine L3 decryptor/guesser like extension. This extension can display widevine decryption keys of any DRM video you watch, instantly, as soon as you play the video! The keys will be shown in-front of your screen!
How does this work?
• This works exactly as how widevine L3 decryptor worked. The only difference is this uses my DRMStuff API in the backend!
Will this work for all sites?
• This will work for almost all sites except for the sites where eme logger functions does not work through extensions. (Which is vary rare!)
1. Solution for the Chrome browser!
• First open the program RUN on windows. (You can find this by searching on the search bar of windows or by pressing WIN + R keys together)
• Paste the following location on the text box on RUN: %LOCALAPPDATA%\Google\Chrome\User Data\WidevineCdm
• Press the button OK. It will open a folder.
• Then in that opened folder check whether it is empty or if an folder exists there. If it has a folder, delete it.
• Now go this link and download the WidevineCDM version 4.10.2557.0 zip file.
• Extract it somewhere and copy the extracted folder.
• Now go to that previous location and paste this folder there.
• If you did everything correctly, it should look like this.
• Now go to this link and download the .bat file. After it gets downloaded, double click it and run it. It will open a folder. This folder will contain two files named widevinecdm.dll and widevinecdm.dll.sig. Delete those files.
• Now go to this link and download the widevinecdm.dll and widevinecdm.dll.sig files and paste them in the above location.
Note:- If you again get the "Signature verification failed!
" error when using the extension in future, that will be because Chrome has updated it self again automatically. If this happens, follow the above procedure again!
2. Solution for the Brave browser!
• First open the program RUN on windows. (You can find this by searching on the search bar of windows or by pressing WIN + R keys together)
• Paste the following location on the text box on RUN: %LOCALAPPDATA%\BraveSoftware\Brave-Browser\User Data\WidevineCdm
• Press the button OK. It will open a folder.
• Then in that opened folder check whether it is empty or if an folder exists there. If it has a folder, delete it.
• Now go this link and download the WidevineCDM version 4.10.2557.0 zip file.
• Extract it somewhere and copy the extracted folder.
• Now go to that previous location and paste this folder there.
• If you did everything correctly, it should look like this.
Note:- If you again get the "Signature verification failed!
" error when using the extension in future, that will be because Brave has updated it self again automatically. If this happens, follow the above procedure again!
3. Permanent Solution. (I hope)
• Download Vivaldi browser for windows from here.
• Install the Vivaldi from the downloaded file.
• Click the setting icon you can find on the bottom left corner. (Check this image if you want to clarify.)
• A new window will be opened. In the general tab of it you will see a section named "Updates
". Under that you will see a button named "Show Update Settings
". Click it. (Check this image if you want to clarify.)
• Under that you will see an option with a tick box named "Automatically Download and Install Updates
". Make sure to turn off it through that tick box. It should finally look like this.
If you do not know how to add the extension on Vivaldi, follow the below instructions:
1. Press Ctrl+Shift+E or go to vivaldi://extensions/ through their address bar.
2. Turn on the "Developer mode
" button.
3. Press the "Load Unpacked
" button.
4. Select the extension's folder and add it.
Note:- I hope with this method you won't get the "Signature verification failed!
" again and (hopefully) you will not have to replace files again and again. Although If you get this error, follow the below steps:
• First open the program RUN on windows. (You can find this by searching on the search bar of windows or by pressing WIN + R keys together)
• Paste the following location on the text box on RUN: %LOCALAPPDATA%\Vivaldi\User Data\WidevineCdm
• Press the button OK. It will open a folder.
• Then in that opened folder check whether it is empty or if an folder exists there. If it has a folder, delete it.
• Now go this link and download the WidevineCDM version 4.10.2557.0 zip file.
• Extract it somewhere and copy the extracted folder.
• Now go to that previous location and paste this folder there.
• If you did everything correctly, it should look like this.
Please test It and share Key if you like It
Introducing Chrome CDM Decryptor What the hell is this?
• This is a widevine L3 decryptor/guesser like extension. This extension can display widevine decryption keys of any DRM video you watch, instantly, as soon as you play the video! The keys will be shown in-front of your screen!
How does this work?
• This works exactly as how widevine L3 decryptor worked. The only difference is this uses my DRMStuff API in the backend!
Will this work for all sites?
• This will work for almost all sites except for the sites where eme logger functions does not work through extensions. (Which is vary rare!)
1. Solution for the Chrome browser!
• First open the program RUN on windows. (You can find this by searching on the search bar of windows or by pressing WIN + R keys together)
• Paste the following location on the text box on RUN: %LOCALAPPDATA%\Google\Chrome\User Data\WidevineCdm
• Press the button OK. It will open a folder.
• Then in that opened folder check whether it is empty or if an folder exists there. If it has a folder, delete it.
• Now go this link and download the WidevineCDM version 4.10.2557.0 zip file.
• Extract it somewhere and copy the extracted folder.
• Now go to that previous location and paste this folder there.
• If you did everything correctly, it should look like this.
• Now go to this link and download the .bat file. After it gets downloaded, double click it and run it. It will open a folder. This folder will contain two files named widevinecdm.dll and widevinecdm.dll.sig. Delete those files.
• Now go to this link and download the widevinecdm.dll and widevinecdm.dll.sig files and paste them in the above location.
Note:- If you again get the "Signature verification failed!
" error when using the extension in future, that will be because Chrome has updated it self again automatically. If this happens, follow the above procedure again!
2. Solution for the Brave browser!
• First open the program RUN on windows. (You can find this by searching on the search bar of windows or by pressing WIN + R keys together)
• Paste the following location on the text box on RUN: %LOCALAPPDATA%\BraveSoftware\Brave-Browser\User Data\WidevineCdm
• Press the button OK. It will open a folder.
• Then in that opened folder check whether it is empty or if an folder exists there. If it has a folder, delete it.
• Now go this link and download the WidevineCDM version 4.10.2557.0 zip file.
• Extract it somewhere and copy the extracted folder.
• Now go to that previous location and paste this folder there.
• If you did everything correctly, it should look like this.
Note:- If you again get the "Signature verification failed!
" error when using the extension in future, that will be because Brave has updated it self again automatically. If this happens, follow the above procedure again!
3. Permanent Solution. (I hope)
• Download Vivaldi browser for windows from here.
• Install the Vivaldi from the downloaded file.
• Click the setting icon you can find on the bottom left corner. (Check this image if you want to clarify.)
• A new window will be opened. In the general tab of it you will see a section named "Updates
". Under that you will see a button named "Show Update Settings
". Click it. (Check this image if you want to clarify.)
• Under that you will see an option with a tick box named "Automatically Download and Install Updates
". Make sure to turn off it through that tick box. It should finally look like this.
If you do not know how to add the extension on Vivaldi, follow the below instructions:
1. Press Ctrl+Shift+E or go to vivaldi://extensions/ through their address bar.
2. Turn on the "Developer mode
" button.
3. Press the "Load Unpacked
" button.
4. Select the extension's folder and add it.
Note:- I hope with this method you won't get the "Signature verification failed!
" again and (hopefully) you will not have to replace files again and again. Although If you get this error, follow the below steps:
• First open the program RUN on windows. (You can find this by searching on the search bar of windows or by pressing WIN + R keys together)
• Paste the following location on the text box on RUN: %LOCALAPPDATA%\Vivaldi\User Data\WidevineCdm
• Press the button OK. It will open a folder.
• Then in that opened folder check whether it is empty or if an folder exists there. If it has a folder, delete it.
• Now go this link and download the WidevineCDM version 4.10.2557.0 zip file.
• Extract it somewhere and copy the extracted folder.
• Now go to that previous location and paste this folder there.
• If you did everything correctly, it should look like this.
Please test It and share Key if you like It
Last edited:
