The woman's father originally bought the painting at a stamp and coin market for 75 cents and only realised when he got home that it was signed by "A.
Hitler", media reported in November when news of the donation became known.
By end of 2014 this mechanism started to be rolled out to most of the public Google services.
Because No CAPTCHA relies on the use of Google cookies that are at least a few weeks old, Re CAPTCHA has become nearly impossible to complete for people who frequently clear their cookies.
The identification performed by each OCR program is given a value of 0.5 points, and each interpretation by a human is given a full point.