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    very reminiscent of Linus Neumann’s Trolldrossel (German for ‘troll throttle’): Depending on the amount of bad words in a given comment, the captcha fails regardless of the answer given. It was installed at a site providing comments for controversial german blogger Fefe when it was overwhelmed with racist, misogynistic and otherwise awful comments.

    Here’s the 2013 talk about it, if you understand German.

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      Hmmm, previous existing works make a patent attackable, no?

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        Yep, it’d be existing prior art. In NZ you wouldn’t be able to patent this concept at all. They’ve banned software patents. The US really needs to do the same.

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          Australia needs to do so also.

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          Only if the existing work is implemented the same as each claim in the patent.