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That's clearly a bot that is reproducing itself inside the forum.
The solution is to include a secret code in each registration form like for example Vb45RSt and ask the person that's trying to register to reproduce the code using the exact low and high cases.
There's a program that you can use which will provide a different code to each registration form.
Bots can't reproduce those secret codes, so you'll be sure that each registered member is a person and not a bot.
I can't help you with names of products or software because as any respectable lawyer my knowledge of this technicall isues is almost equal to nothing, but I'm sure you must know some expert.
Iván
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