Is it just me, or is Captcha getting a little too difficult to
translate lately? Taking two or three tries sometimes. Seems to me
they could figure out a better way of doing that, so that we
humans can see it easily.
The 'official' Captcha (TM) system is actually a cooperative effort with
some folks who are attempting to digitize books.
One of the words will be easy to identify by human eye, but the other
will be an actual screenshot of a garbled word taken from a scan of a
text that the OCR program could not decipher. The idea is that if enough
people identify the garbled word the same way then the entry can be
corrected in the digital text.
So instead of spending your time entering 2 words or a number for
security for nothing you are spending your time to help out a 'worthy'
cause.
Or you are being employed to do someone else work for free. Depends on
how you look at it.