Derivative Projects
reCAPTCHA had also created project Mailhide, which protects email addresses on web pages from being harvested by spammers. By default, the email address is converted into a format that does not allow a crawler to see the full email address, for example, "mailme@example.com" would be converted to "mai...@example.com". The visitor would then click on the "..." and solve the CAPTCHA in order to obtain the full email address. One can also edit the pop-up code so that none of the address is visible.
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