When you make a captcha, it’s supposed to be human-readable and not-machine-readable.
Not the other way around.
More reasons “screw educating users, trust the programmers to do security design” is not the solution.
http://svedic.org/programming/worst-captcha-ever
“They put CAPTCHA in a plain HTML text, and then put an ugly background below so it can’t be read by humans.”
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