Difference between CAPTCHA and reCAPTCHA

CAPTCHA is the human validation test (usually the blurry squiglly letters that need to be deciphered) used by many sites to prevent spam. reCAPTCHA is a reversed CAPTCHA – the same test, used not only to prevent spam but to help in the book digitazion project. In other words, the reCAPTCHA tests are not meaningless combination of … Read more

reCAPTCHA ERROR: Invalid domain for site key

In case someone has a similar issue. My resolution was to delete the key that was not working and got a new key for my domain. And this now works with all my sub-domains as well without having to explicitly specify them in the recaptcha admin area