Slave is correct.
DOC= Death of C4D's
Basically it's a method of creating your own effects without the use or help from C4D's, brushes or any other outside source. Docing primarily focuses on using Liquify and the Pen-tool at a very high level by controlling and manipulating layers and/or pixels (1 by 1)
It is also a very efficient way of controlling the flow of a signature as well as making it look much more elegant. When someone Docs a signature you can really appreciate the time, effort, dedication and creativity that went into the making of it.
^ This can also be used as my explanation as to why I voted for Rad, Pro's sig is very cool looking and I like the texture of it but in this case Rad got my vote.
Good job to the both of you.