I had forked you, but after reading this I decided to remove the git repository too.

I think reCaptcha is overused by services that should be publicly available for automation, specially in Brazil. I think this is a bad use case for reCaptcha or any other captcha system.

But I also understand that the majority of reCaptcha users are fighting against spam, and the public description of their javascript engine could really hurt the Internet.

Anyway... congrats for your work!