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what is that thing called?

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system9898

system9898

Programmer
Jun 7, 2007
14
0
0
US
It's on the tip of my tongue, but the word eludes me. Can anyone please tell me what the software is called that provides those random letters/numbers to verify human form input on a website? (like at a paypal or godaddy whois lookup)

Secondly, anyone know of a good open-source version that is quick and easy to implement?
 
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