Acrobat XI Pro - How can I have clients sign pdf docs with stylus on my Tablet PC WITHOUT having to subscribe to signature services like EchoSign?

I was told there was a "Setting" in XI Pro that would allow me to have clients sign pdf documents with a stylus on my Tablet PC (I have a MS Surface Pro 2), without having to sign up for EchoSign or any other electronic signature service. Is that correct? If so, what is the setup or settings?