How To Fix This Blu-Ray Disc Needs A Library For AACS Decoding Issue

When trying to play a Blu-Ray disc on your Windows 10 computer using the VLC app you will sometimes get the error “This Blu-Ray Disc needs a library for AACS decoding”. One of the main causes that triggers this error message is that the disk is protected by AACS and BD+ technology. Another possible reason is a missing KeyDB.cfg file. In this latest installment of our troubleshooting series we will tackle the Blu-Ray disc needs a library for AACS decoding issue.

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How To Fix This Blu-Ray Disc Needs A Library For AACS Decoding Issue

To fix this problem you will just need to add some library files to VLC to enable it to decode AACS.

  • Go to this link: 
  • Download the KeyDB.cfg file
  • Go to the AACS Dynamic library then click on the link of the VLC version that you are using.
  • Copy the KeyDB.cfg you your clipboard then use file explorer to navigate.
  • Press Windows key + R to open up a Run dialog box. 
  • Type “%APPDATA%\” and press enter to open the hidden Appdata folder.
  • Create a new folder (Right-click > New > Folder)  and name it aacs
  • Open the newly created aacs folder and paste the KEYDB.cfg file
  • Navigate to your download folder and copy the libaacs.dll file to your clipboard.
  • Use File Explorer to navigate to the install location of VLC and paste it there. The default location is C:\Program Files\VideoLAN\VLC (64 bit) or C:\Program Files (x86)\VideoLAN\VLC (32-bit).
  • Open VLC and open the Blu-Ray disk that was previously failing with the “This Blu-Ray Disc needs a library for AACS decoding”. 

At this point the Blu-Ray Disc Needs A Library For AACS Decoding Issue will already be resolved.

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