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Thank you to everyone who responded to this post. I've updated the KEYDB file again this morning (Just a few days newer that the last one I had downloaded) and the issue seems to be resolved. The process that I used to update the file locally was the same process that I've used prior - not sure what...

FYI - Yes, I've downloaded the latest KEYDB file and restarted MakeMKV. Same results.

Providing a tgz for UHD 4k release of Lifeforce to assist with updating the KEYDB file. I received a "The volume key is unknown for this disc - video can't be decrypted Failed to open disc" error using the latest version of MakeMV and KEYDB. MKB20_v76_Lifeforce_DE63.tgz Link to the tgz fil...

Providing a dump file for UHD 4k release of Tron Legacy to assist with updating the KEYDB file. I received a "The volume key is unknown for this disc - video can't be decrypted Failed to open disc" error using the latest version of MakeMV and KEYDB. MKB20_v77_Tron-_Legacy_EDFB.tgz Link to ...