Captcha Verification (or Completely Automated Public Turing Test to tell Computers and Humans Apart) is a common web technique used to help ensure that your respondents are real humans and not a program written to spam your survey.
This is a Lazarus implementation that you can use in your own projects.
It's a fork from the Delphi version here: Captcha Verification by Jens Borrisholt.
Linux
Wine
Windows
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Need to get that background to be white. - Need to find out why optimization greater than 1 messes up the font size and rotation in Linux.
- Need to make this into a Visual component like the one WP made: captcha_component