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

Most digital media these days includes Digital rights management (DRM) as a way to protect copyrights. DRM systems used on Blu-ray discs include AACS and BD+. To playback a Blu-ray disc, a media player such as VLC requires the libaacs.dll and keyDB.cfg libraries. These library files circumvent AACS and BD+ protection.

A library for AACS decoding is required to access encrypted data on a blu-ray disc. If this library is missing, the player will display “This Blu-Ray Disc Needs A Library For AACS Decoding” error message.

There are a few options for when you encounter this issue:

  1. Install the library manually.
  2. Switch to a different media player.
  3. Update your VLC to the latest version.

Manually installing the library is the most dependable option, but it sometimes needs quite a bit technical expertise. If you’re not comfortable with fiddling around, you may try switching to a different media player or update your VLC to the latest version. In rare circumstances, a separate operating system with better DRM support may be required.

In this article, we’ll outlined the steps required to resolve “This Blu-Ray Disc Needs A Library For AACS Decoding” error, as well as other similar issues with VLC and blu-rays.

Fix “This Blu-ray Disc Needs A Library” Error

Adding the libaacs file can resolve a difficulty that VLC encountered when decrypting the contents of a Blu-ray disc using known AACS keys. These keys, which are also known as Volume Unique Keys (VUK) or Unit Keys, are kept in the keyDB database file.

The solution is straightforward. Follow the steps below to download and put these files in the appropriate location:

  • Visit the VLC Blu-ray keys database (FindVUK Online Database). This site includes thousands of Blu-ray keys collected and validated.
  • Scroll down, look for the appropriate KeyDB.cfg file for your language. In this example, we’ve selected the English one. download appropriate KeyDB.cfg file
  • Head over to AACS Dynamic Library and download the appropriate libaacs.dll for your system. There are separate file for Windows 32-bit, Windows 64-bit and Mac OS X. get libaacs.dll
  • Linux users should install libaacs package using their distribution package manager. For example, on Ubuntu, you can run sudo apt-get install libaacs-dev to do that.

On Windows

The following are the steps to resolve the VLC AACS Decoding problem in Windows:

  • Unzip keydb into your Downloads folder.
  • Copy the keydb.cfg file from the unzipped folder.
  • Press Windows + R to open Run dialog, input %appdata% to go to the AppData folder.
  • Create a new folder called aacs here, then put the downloaded keydb.cfg inside it.
  • Copy the downloaded libaacs.dll file into the VLC directory. It should be C:\Program Files (x86)\VideoLAN\VLC if you’re using VLC 32-bit and C:\Program Files\VideoLAN\VLC if you use VLC 64-bit.
  • Relaunch VLC, you should be able to play the Blu-ray disc properly now.

On Mac

On MacOS, you should now have the keydb.cfg and libaacs.dylib file.

  • Press Option+Command+Space hotkey to launch Finder. Go to  ~/Library/Preferences/aacs/ and paste keydb.cfg file here. If there’s no aacs folder, create it manually and paste keydb.cfg inside.
  • Copy the libaccs.dylib file to /usr/local/lib/ directory (again, create it if it does not exist).
  • Relaunch VLC, you should be able to play the Blu-ray disc properly now.

Update VLC

It is recommended to upgrade the VLC media player to the most recent version, which includes new bug fixes, new features, and program enhancements. This might easily resolve the “This Blu-ray disc requires a library for AACS decoding” error, especially if the program hasn’t been updated in a long time.

Follow the instructions below to update VLC

  • Open the VLC media player and select Help > Check for updates. VLC Check for updates
  • If there is a new version of VLC available, you should see something like the image below. Click Yes to start downloading the update. new version of VLC available
  • VLC media player will begin downloading the files required to install the upgrade. When the download is finished, you’ll see the message “The new version was successfully downloaded. Do you want to close VLC and install it now” dialog box appears. select Install.
  • Once the installation finishes, relaunch VLC, try to play the Blu-ray disc to check whether the error gone away or not.

We hope that this tutorial provides useful information to help you successfully fix “This Blu-Ray Disc Needs A Library For AACS Decoding” error. You might also want to check out our article on The Best Linux Video Converters and The best open-source DLNA servers.

If you spot any error in the article, or have a suggestion, please kindly let us know via the comment section below.

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