# Captcha Rules

**URL:** <https://www.ruby-forum.com/t/captcha-rules/91919>\
**Category:** Rails\
**Created:** [April 13, 2007, 12:32pm UTC](https://www.ruby-forum.com/t/captcha-rules/91919 "2007-04-13T12:32:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jazzybuddy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/f4b2a3/32.png) [@jazzybuddy](https://www.ruby-forum.com/u/jazzybuddy)\
**Post date:** [April 13, 2007, 12:32pm UTC](https://www.ruby-forum.com/t/captcha-rules/91919/1 "2007-04-13T12:32:34Z")

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Hi Everyone out there,  
Can anybody tell me what are the rules for designing captcha.  
That is, should it have only limited number of letters and things like  
that…

THNX,  
Jazzzzzzzzzzzy,