How does this checkbox recaptcha work and how can I use it?

Question

I\'ve recently signed up to the oneplusone website https://account.oneplus.net/sign-up, and noticed this checkbox recaptcha

How does it work, and how can I

Answer 1

Thank you all for your contribution to this thread, it's great to see so many people interested in the new recaptcha tool.

I couldn't find a .net implementation of it, so have built a simple web forms control, that you can find here https://github.com/pnmcosta/recaptchav2dotnet