MakeMKV v1.12.0 win(x64-release) started
Debug logging enabled, log will be saved as C:\Users\Bernard/MakeMKV_log.txt
Using direct disc access mode
Saved SD dump file as C:\Users\Bernard/.MakeMKV/dump_SD_9E91B21F784F515B7809.tgz
Saved AACS dump file as C:\Users\Bernard/.MakeMKV/MKB20_v61_Dunkirk_AAF7.tgz
The volume key is unknown for this disc - video can't be decrypted
DEBUG: Code 0 at mV4(%n/4s|39{CnS:121264257
DEBUG: Code 0 at mV4(%n/4s|39{CnS:121265890
Failed to open disc
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Assuming that you have the latest key file in your MakeMKV directory, the key for your particular disk may not be known yet.
In that case, you would send the file C:\Users\Bernard/.MakeMKV/dump_SD_9E91B21F784F515B7809.tgz to svq@makemkv.com for analysis and inclusion in the next update of the key file.