[smcl]

You don't even need to be a particularly smart hacker. Even just dumping a screenshot of the page [1] using phantomjs gives you a relatively legible image.

[1] http://blog.mclemon.cz/apple-nucaptcha-easy-to-break

[amitdugar]

so apparently reCaptcha is more secure than this one.

From Nucaptcha's website : "...most secure and usable Captcha solution in the market." :D