This Blu-ray disc needs a library for AACS decoding, and your system does not have it.” You read this because you got a Blu-ray error when trying to play a Blu-ray disc with VLC Player on your computer.

This Blu-ray needs a library for aacs decoding

VLC is a good player software for Blu-ray content on Windows, macOS, and even Linus, but it still can’t play Blu-ra discs that are protected by AACS or BD+ nonetheless. To enable VLC to play those commercial Blu-ray discs, you must find the valid library for AACS decoding and put it into the right place so that VLC can invoke it for decrypting Blu-ray content.

In today’s post, we will tell you what is AACS and how we find the library for AACS decoding to make VLC eligible to play Blu-rays.

Part 1: What Is AACS

AACS is short for Advanced Access Content System which is a standard for optical media content distribution and digital rights management.

Accordingly, content publishers will apply AACS to Blu-ray discs and since then, all unauthorized access to the Blu-ray content will be banned.

Blu Ray Disc BDMV File

Part 2: Why Does “Blu-ray Needs a Library for AACS Decoding” Occur to VLC

This AACS specification works by encrypting the media burned on the Blu-ray. To play the protected disc content, only hardware (like Blu-ray players and PS5) with the right keys can decrypt AACS.

Missing AACS Library: keydb.cfg file & libaacs.dll

When we play a Blu-ray disc on a computer, we need a media player program compatible with AACS to decode and process the Blu-ray.

This is the reason why you cannot play the Blu-ray disc on VLC. VLC is not installed with any keys or libraries to handle AACS encryption.

Luckily, many AACS decryption keys like keydb.cfg & libaacs.dll have been extracted and published on the internet, enabling decoding the AACS-protected Blu-ray Media with open-source software such as VLC.

VLC Is Out Of Date

A group of VLC users may argue about the fact that they’ve added the AACS decoding library to VLC but this error code still appears.

This possibly results from the version of the VLC software. When the VLC is too outdated, it may lose the ability to find the latest AACS decoding libraries even if they’re installed. So, we need to update the VLC Media Player to re-enable its power to find the AACS library.

Blu-ray Player

Ultimate Blu-ray Player

Best All-in-one Blu-ray, DVD, and Media Player Software

  • One-click Play Blu-ray disc, BD Folder, & BD ISO
  • Decrypt DRMs like BD+, AACS, Cinavia, etc
  • Supports 3D, 4K UHD, 8K, AVCHD, and more

*Works on Windows 11 & macOS Ventura

Part 3: How to Fix “Blu-ray Needs a Library for AACS” in VLC

To fix this AACS library issue and make VLC eligible to play Blu-ray, we need to manually add the AACS library to the software.

For those who have already installed the keydb.cfg file and libaacs.dll to VLC, check on the steps to update VLC to the latest.

How to Manually Add AACS Libray to VLC

Step 1

Go to VLC Blu-ray, you may see an error page saying “Your connection is not private”.

Click on the Advanced button to enlarge the error explanation tab and click Proceed to vlc-bluray.whoknowsmy.name (unsafe).

VLC AACS Library Download

Step 2

You need to download two files:

  • libaacs.dll – this is the AACS decoding library (For Mac, it’s libaccs.dylib)
  • keydb.cfg – this is the decryption key to AACS and it will be used by libaacs.dll.

Click on “Fetch the up-to-date file from FindVUK online database and unzip it” to download keydb.cfg – Language English . Or pick any version based on your language background.

As for the libaacs.dll, locate the download links below AACS AYNAMIC LIBRARY. Download the right one according to your computer OS.

Since I am in Windows 10 64-bit, I will download the VLC 64-bit Windows version.

Step 3

Both files are ready, we need to add them to the right locations so VLC can use them to play a Blu-ray.

For Windows:

Press Win + R to launch the Run application and enter %appdata%. Then click OK to open the directory of AppData. Open the Roaming folder. There, create a new folder named “AACS” and copy the keybd.cfg into the AACS folder.

Add keydb.cfg to PC

Put libaacs.dll in your VLC installation directory (right-click on the desktop icon of VLC and choose Open File Location).

Add libaacs.dll to VLC

For Mac: (Create the folders of “aacs” & director”)

  1. Put keydb.cfg in ~/Library/Preferences/aacs.
  2. Put libaccs.dylib in /usr/local/lib/directory.

Step 4

Restart VLC and open the Blu-ray disc once again.

Now you probably have fixed the “This Blu-ray Disc needs a library for AACS decoding, and your system does not have it” error. Make sure that you have followed the fixed guide carefully. If it doesn’t work. Please check the locations of the two AACS files. Or move to update your VLC software.

How to Update VLC to Fix AACS Decoding Library Error

Launch VLC on the computer and locate the Help option at the top menu bar. Hit Check for Update from the drop-down list.

Download the latest package and install the software. Launch VLC after everything is settled. Play the Blu-ray.

Blu-ray Player

Ultimate Blu-ray Player

Best All-in-one Blu-ray, DVD, and Media Player Software

  • One-click Play Blu-ray disc, BD Folder, & BD ISO
  • Decrypt DRMs like BD+, AACS, Cinavia, etc
  • Supports 3D, 4K UHD, 8K, AVCHD, and more

*Works on Windows 11 & macOS Ventura

Bonus:  How to Play Blu-ray without AACS Errors

VLC Media Player is not the only solution to play Blu-ray discs on Windows and Mac computers.

If you don’t want to see the Blu-ray errors when playing Blu-ray content with VLC or you just can’t fix the “Blu-ray Disc needs a library for AACS decoding” error, pick another media player program that’s AACS-compatible.

Play Blu-rays with Aiseesoft Blu-ray Player

For smooth and successful Blu-ray playback, echoshare Blu-ray Player is a decent choice for Windows and Mac computers. This is a professional Blu-ray player program that’s embedded with multiple decryption libraries including AACS, BD+, and Cinavia.

Download the software on your computer and you’re able to stream Blu-ray discs or Blu-ray formats with great ease. You won’t have to download any extra files or plugins. With one simple click, echoshare Blu-ray Player will start to play the Blu-ray movie and give you the ultimate visual experience.

Blu-ray Player

Ultimate Blu-ray Player

Best All-in-one Blu-ray, DVD, and Media Player Software

  • One-click Play Blu-ray disc, BD Folder, & BD ISO
  • Decrypt DRMs like BD+, AACS, Cinavia, etc
  • Supports 3D, 4K UHD, 8K, AVCHD, and more

*Works on Windows 11 & macOS Ventura

How to Play AACS Protected Blu-ray Disc

Step 1

Install the Blu-ray Player software mentioned above on your Windows or Mac.

Step 2

Launch the Player and click Open Disc on the middle menu of the interface.

Open Blu-ray Disc on Aiseesoft Blu-ray Player

Then you are free to enjoy your Blu-ray movie on your PC now.

Tip:

Besides turning to an AACS-compatible player, you have another feasible solution: to rip the Blu-ray disc to a digital video file. In this way, you can play the video with any ordinary player on your computer. To rip a Blu-ray disc, you need to appeal to Blu-ray Ripper.

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