This Blu-ray disc needs a library for AACS decoding

Some Windows users get the error “This Blu-Ray disc needs a library for AACS decoding” when they try to play Blu-ray disc through VLC media player. The problem is not specific to a certain version of Windows, as it has been reported to occur in Windows 7, Windows 8 and Windows 10. What's more, the error message has been reported to appear in various versions of VLC.

This Blu-ray disc needs a library for AACS decoding.

What is causing the error “This Blu-ray disc needs a library for AACS decoding”?

We investigated this by looking at some methods that other users in a similar situation have used successfully to resolve the error message. From what we have collected, there are a couple of common scenarios that will trigger this particular error message:

• Blu-Ray discs are protected by AACS and BD technologies +. Nowadays, Most commercial Blu-Ray discs are protected by AACS and BD technologies. +. Because of this, the standard libbluray library is not sufficient to play these discs. In this stage, the solution is to install libaacs library.

• KeyDB.cfg file is missing: Another common reason why Blue-Ray playback fails with this particular error is if the KeyDB.cfg file is missing from the computer. This file is required for the libaacs library.

If you are having difficulty resolving this particular error message, This article will provide you with several steps that other users in a similar situation have used to solve the problem successfully.

How to fix the error “This Blu-Ray disc needs a library for AACS decoding”

A couple of users who encountered the same error “This Blu-Ray disc needs a library for AACS decoding” got VLC to play Blu-ray discs by adding some AAC required library files.

The procedure is pretty straightforward for the most part. You should have no problem correcting the problem as long as you follow the instructions below exactly. This is what you have to do:

Warning: the following procedure is to download some files from a website without an SSL certificate. Although we have scanned the files and found no evidence of malware, download at your own risk. The VLC player is an open source player with many forked versions that are not signed by their developers.

1. Visit this link (here), go to the key database and click Get File to download the KeyDB.cfg file. Later, go to the AACS Dynamic Library section and click on the hyperlink associated with the version of VLC you are using. Download the AACS dynamic library and key database files

2. Copy the KEYDB.cfg file to your clipboard. Then use File Explorer to navigate

3. Press the Windows key + R to open a Run dialog. Then write “% APPDATA%” and hit enter to open hidden Appdata folder Open hidden Appdata folder via Run dialog