Does anybody know where can I find a good system to generate those images used to verify if it is a real person that is filling out a subscription form?
One example is the one used at Yahoo!
check out
mexnix on 2003-03-24T23:45:50
merlyn wrote an article on this for one of his magazine columns in the last year or so...check out his site.
Been there, wrote a column
merlyn on 2003-03-24T23:54:40
I did
one of those for a column. It's rudimentary (and was trivially reverse-engineered in a posting at
Perlmonks, but it would fool 98% of your visitors (and confound the other 2%).
