again an off-topic question, but I guess many of you have an answer and I tend to trust you, fellow riveters.

I will do a small web site for scientific conference and I must accept subscription form data without authentication, so I thought that having something like Captcha could be useful for this case.

Do you have former experience on this, do you have recommendation for an open source, easy to deploy solution?

thanks

 -- Massimo

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