The error message in MakeMKV occurs when the software cannot reach its external master servers to download the Hash Key (HK) table required to decrypt 4K UHD Blu-ray discs . This problem prevents users from ripping newer or unsupported UHD movies because the local database lacks the necessary AACS 2.0 decryption keys.
Here is content explaining the error and how to resolve it. makemkv automatic hk downloading is disabled or failed upd
To protect content, commercial Blu-ray and 4K UHD discs are encrypted using Advanced Access Content System (AACS) technology. When you insert a newer movie, MakeMKV needs a specific key sequence to decode the data. The error message in MakeMKV occurs when the
The failure is usually caused by network-level blocks, as the key servers are located in regions (such as Russia) that many ISPs, firewalls, and DNS services proactively block. To protect content, commercial Blu-ray and 4K UHD