Reminds me of EURion rings on banknotes. The issue is that this needs to be visible while unobstructive to the user. What about something pictographic, like HTTPS' padlock icon? Look for that in any user content with an input field and flag it when found. Of course, that still assumes users would check for the lock in the first place.https://en.m.wikipedia.org/wiki/EURion_constellation
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