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You mean this kind of MiniDisc? 😕
 

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Since the OP found his solution without bothering to post it, rendering this thread useless for anyone who finds it, here is the potential answer.

If you are the owner of the file then you can unlock via Finder using Get Info (command + I) or Inspector (command + option + I).

If you are not the owner of the file you can unlock via Terminal:

Code:
sudo chflags nouchg /path/to/file
 
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