[thelist] force a human intervention requirement for signups or access to resources

John C Bullas (soton.ac.uk relay) jcbullas at nildram.co.uk
Wed Feb 11 05:23:56 CST 2004

><tip type="preventing people using your online resources"
>author="David Dorward">
>Forcing people to type in the text hidden in a graphic is a good way to 
>make it impossible for users who can't see graphics (they might be blind, 
>they might just be using a text browser) to use your site.
>What's more, I hear that Porn sites are now trading conversions of 
>graphics to text for images. So their evilBot gets the graphic, passes it 
>to the user, finds out the text, signs up to the service and gives the 
>user porn. So images are no longer an insurmountable barrier to automated 
>If you do use an image, make sure there is an alternative way for people 
>who can't make use of it to sign up.

A Very valid point....... never thought about that ;(


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