www.makemkv.com

Hello,
Bravenheart CEE version are dosen't support.

Saved AACS dump file as C:\Users\Gogeta/.MakeMKV/MKB20_v61_Braveheart_76AE.tgz
The volume key is unknown for this disc - video can't be decrypted
Failed to open disc

READ this:

viewtopic.php?f=12&t=18109

Same exact thing applies to you and your disk and ANY disk currently not supported and which returns that error. READ and follow the instructions discussed in that post.

You need to read the FAQ which explains all of this in detail and it's also linked in the above discussion.

If you already sent the dump to Mike then it can take a few days for it to become supported. It's not always immediate. Patience.