Fix: This Blu-ray Disc needs a library for AACS decoding

Tashreef Shareef
by Tashreef Shareef
Windows & Software Expert
Tashreef Shareef is a software developer turned tech writer. He discovered his interest in technology after reading a tech magazine accidentally. Now he writes about everything tech from Windows to iOS and streaming services... Read more
Affiliate Disclosure
  • The Blu-ray disc needs a library for AACS decoding error in VLC signals that your Blu-ray disk is protected by AACs and BD+ technologies.
  • While VLC is a well-equipped video player, the lack of libraries can hinder its efficiency and can even cause error messages.
  • We will be looking over one such error message and also over the troubleshooting steps that you need to take to bypass it.
Fix This Blu-ray disc needs a library for AACS decoding

To fix various PC problems, we recommend Restoro PC Repair Tool:
This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues and remove viruses now in 3 easy steps:

  1. Download Restoro PC Repair Tool that comes with Patented Technologies (patent available here).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues affecting your computer's security and performance
  • Restoro has been downloaded by 0 readers this month.

VLC Media Player is one of the most popular media players available on the Windows platform, and it is fully capable of playing several video formats.

That said, some users have repeatedly reported This Blu-ray Disc needs a library for AACS decoding, and your system does not have it error when trying to play a Blu-ray disc using the VLC media player.

This error can occur on both the older and newer version of Windows, including Windows 7, 10, and 11.

What are the possible causes for the AACS decoding error?

The issue can be triggered if your Blu-ray disc is protected by AACs and BD+ technologies or if the KeyDB.cfg file is missing from the disc.

If you are also troubled by this problem, here are a couple of troubleshooting tips to help you resolve This Blu-ray disc that needs a library for AACS decoding error in Windows.

No valid processing key was found in the AACS config file

Here’s an interesting scenario that we believe deserves its own special section. AACS is a standard for content distribution designed to prevent infringement of digital rights through unauthorized disc copies.

It’s similar to the AES encryption standard and it relies on keys to control who has access to the contents of a disc.

There are 4 major pillars that allow the decryption of an AACS-protected disk: MKB (the Media Key Block), The Encrypted Keys, the Volume ID, and the Encrypted Content.

If one of them is revoked, misplaced, or otherwise not available, you simply cannot play the respective content.

The no valid processing key found in AACS config file error is self-explanatory (the encrypted title key is missing), while the AACCS decoding error in VLC indicated that the player lacks the necessary libraries to play the content.

Expert Tip: Some PC issues are hard to tackle, especially when it comes to corrupted repositories or missing Windows files. If you are having troubles fixing an error, your system may be partially broken. We recommend installing Restoro, a tool that will scan your machine and identify what the fault is.
Click here to download and start repairing.

If you’re not up for the troubleshooting, you can simply use a multimedia converter tool that also removes additional protection such as DRM, AACS, or others.

How do I fix the Blu-ray disc AACS decoding VLC error?

1. Add libraries files to AACS

Note icon
The following steps require you to download a file from a third-party site while your browser may show it as unsafe.

We have scanned the files and found them to be safe to use.

However, due to the unsigned nature of the file, the URL and the file will be flagged by the browser and then the computer. Download the file at your own risk.

  1. Visit the website.
  2. You may see a warning showing the site does not have an SSL certificate. Click on the Continue link if you want to proceed.
  3. Under Keys Database, click on the get the file link.
  4. It will download the KeyDB.cfg file.
  5. Next, under the AACS Dynamic Library section, click that file hyperlink associated with your VLC Media Player version.
  6. Once downloaded, copy the KeyDB.cfg file.
  7. Press Windows key + R to open Run, then type %Appdata%, and click OK.
  8. In the Roaming folder, click the New folder icon on top, and name the folder as aacs.
  9. Open the newly created aacs folder and paste the KeyDB.cfg file copied earlier.
  10. Now, open the Downloads folder and copy the libaacs.dll file to your clipboard.
  11. Press the Windows key + E to open File Explorer and navigate to the following location: C:\Program Files\VideoLAN\VLC or C:\Program Files(x86)\VideoLAN\VLC
  12. Paste the copied libaacs.dll file inside the VLC folder.

Once done, launch VLC Media Player and try playing the Blu-ray disc that was triggering the Blu-ray disc decoding error previously.

After copying the required library files to the correct folder, the VLC Media Player should play the Blu-ray disc without any issues.

2. Remove AACS protection using Leawo Blu-ray Ripper

  1. Go to the dedicated Leawo Blu-ray Ripper website, download and then install the software on your machine.
  2. Start Leavo Prof. Media and click on Blu-ray Ripper.
  3. Under the Convert tab, click on Add UHD/Blu-ray/DVD and select Add from CD-ROM.
  4. Now, you need to select the output format.
  5. Finally, select the output folder and hit the Convert button below.

The AACS decoding error from VLC comes from the fact that the player doesn’t have the libraries to handle it.

But instead of tinkering with the VLC libraries, you can convert the video and remove any protection, including AACS with a tool like Leawo Blu-ray Ripper.

After you complete the steps presented above, the Blu-ray disc protection will be successfully removed and you will get digital video files from the source Blu-ray disc for smooth playback.

Using this tool is a really good VLC alternative and helps you remove AACS protection from Blu-ray discs easily.

But that’s not all. Leawo Blu-ray Ripper is a component of Leawo Prof. Media, an extensive bundle that offers a lot more multimedia features. For instance, you can even rip Blu-ray to MP4, and other formats.

This Blu-ray disc needs a library for AACS decoding error that occurs if the media player fails to find the required library files that are required to play the content in the disc.

Of course, you can also avoid any such VLC errors by getting a better media player that will not have a problem running a protected Blu-ray.

We hope that the solutions provided above will help you fix this issue and now you can see your Blu-ray without any errors.

idee restoro Still having issues? Fix them with this tool:
  1. Download this PC Repair Tool rated Great on (download starts on this page).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues with Patented Technologies (Exclusive Discount for our readers).

Restoro has been downloaded by 0 readers this month.

Frequently Asked Questions

This article covers:Topics: