@kneekoo: I respect your good work and I am sure nobody, who helps out here in this board wants a competion or something like that. All coders around PHPFusion work for free :)
But, an individual question on the register.php is the best and most effective method to protect a site against bots. Bots have no brain and so they can not answer the question.
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They can all be bypassed at some point.
If every user takes another question, they never can be bypassed.
Your infusion is really great, but you always have to update the method of "catching" the bots. And it will become more and more difficult for you, if they change it always and make their bots better.
At this point:
@B@Z: No! "1+1" is not secure! You need an individual question or something other, what is individual, for your site. For example: What color has the sky?
A bot can count 1 plus 1, but he does not know the color of the sky ;)
And yes kneekoos infusion is very good to delete the bots, which registered on your site in the past. But for the future you should make something individual on the register page. You do not have to use my mod, you can also do handle it like shearer. But is more easy for you to use my mod, there you don't need anything to know about php.
But I know, that my mod is a MOD and an infusion would be easier for the people. But in this case you must edit the register.php ...
Here I wrote what to do.