I think you're refering to the "CAPTCHA" technique. While I've never investigated it, I believe there are free tools. Note, however, that spammers have resorted to image-recognition software for mass harvesting.
Yes folks, it's a war of escalation, with Slim Pickens riding The Bomb down as the finale. (Dr. Strangelove, for those of you not blessed by one of the best movies ever made.) Rainer Blake wrote: > Are we worried about human spammers or bots? If the latter, isn't > there a free tool that allows generation of those graphic security > checks? (The ones with the fuzzy letters - the name escapes me at the > moment). We have registration required now for edits, but we could > harden the reg. process. > > Blake
