Still able to copy text after disabling command

Hello there, I'm trying to disable Copy (ctrl + C) using java UNO API. I could find this example: https://wiki.openoffice.org/wiki/Documentation/DevGuide/WritingUNO/Disable_Commands and it works perfect for commands such as Open and Save. The problem with Copy is that even the command not being in menu, I am still able to Copy text using Ctrl + C. Is this a bug? If so, how can I prevent user from copying content from the document? Thanks in advance.

Context

Still able to copy text after disabling command · Lucas da Cunha

Re: Still able to copy text after disabling command · Maxim Monastirsky

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