Fix: This Blu-ray Disc Needs a Library for AACS Decoding

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by Tashreef Shareef
Tashreef Shareef
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... read more
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Vlad Turiceanu
Vlad Turiceanu
Passionate about technology, Windows, and everything that has a power button, he spent most of his time developing new skills and learning more about the tech world. Coming... read more
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  • 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

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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.

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.

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

What is AACS Blu-ray?

The Advanced Access Material System, often known as AACS, is a standard for the distribution of content as well as digital rights management. Its primary function is to limit users’ ability to access and duplicate optical discs that are of a post-DVD generation.

In April of 2005, the specification was made available to the public. And it has since been accepted as the standard for the access control mechanism utilized by HD DVD and Blu-ray Disc (BD).

The Blu-ray Disc (BD), more commonly referred to as just Blu-ray, is a storage format for digital optical discs. It is intended to replace the DVD format and has the capacity to store high-definition video for a number of hours at a time.

The most common uses for Blu-ray are as a storage medium for visual content such as full-length movies. And as a method for the physical delivery of video games for gaming consoles such as the PlayStation 3, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X.

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.

What can I do if 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.

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.appdata-ok blu ray needs a library for aacs decoding
  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 Windows 10 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.

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Once done, check if the Blu-ray AACS decoding error in VLC is still showing up.

After copying the required library files to the correct folder, the VLC Media Player should play the Blu-ray disc.

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.leawo-format blu ray needs a library for aacs decoding
  5. Finally, select the output folder and hit the Convert button.

The VLC AACS decoding error in Windows 10 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.

What is an AACs configuration file?

In computing, configuration files, sometimes referred to simply as config files, are files that are used to specify the parameters and initial settings for certain computer applications.

They are put to use in user applications, server processes, and the configuration of the operating system.

The AACs file contains a list of the Disk Identifiers and Decryption Keys that are required in order to play Blu-ray discs.

For more information, check out our post on the five best Blu-Ray creator software in order to start creating high-quality videos.

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

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