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Is it possible to configure VIM so that when an attempt is made to edit a file encrypted by VIM, or to encrypt a file, VIM would warn or refuse such action?

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I think you should build your custom version of Vim excluding this feature (FEAT_CRYPT) completely. This is the most complete and error-prone solution.

To make Vim fail on attempt to write encrypted data you can try something along those lines

augroup example | au!
    autocmd BufWritePre * if !empty(&key) | throw "No encryption allowed here!" | endif
augroup end

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