How to check for a real person?

Some sites have some checks to make sure that the data is being sent
by a real person.
Something like this:

See this code? [there is a image here with random letters and
Re-type it here [you have to enter exactly what is show above]

Any help will be appreciated.

It’s called Captcha

Here’s 10 examples (reCaptcha probably being the most common):

Thanks Lee, this helps me a lot.

On Mar 19, 9:55 am, Lee S. [email protected]


implement a negative captcha! I kind of like this idea.

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