Well arguably, at what point does the computer have ownership over the work done? Certainly there are generators which simply play mad-libs. And then there's stuff that fluctuates grammar as well.

But does the computer own the writing generated? Or did the human write it through proxy, by simply writing code to generate the writing for him?

No matter how complex the algorithm, a human certainly wrote it. So depending on what you mean, the entire work (even these 'roboarticles') could be claimed by a human. if you generate HTML code, is that the computer writing the code? Or is it the human writing code to generate code on his behalf?

Taking that into thought, and removing the "object ownership" idea, your parents "generated" you, so does that mean everything you write is "written" by them, via proxy of creation? That is, they worked to create and raise you in a certain way, at which point you'd output the desired text. Just like the programmer, they can't be sure of the exact output, but are responsible by proxy. Does that mean your work is yours? What does ownership even mean?

In the case of mad-libs generators, I'd say that the final product is written by the computer, but the preset text is not. That is, cleverbot is communicating through lines of chat that has been given to it. The chat log is written by cleverbot, even though the individual lines were outsourced to humans.

At what point does the computer obtain autonomy? At what point do humans obtain autonomy? Did you really write the book? Or did the computer write the book in response to your key presses. Did you really write the book? Or did the pencil you manipulated do so?

you need so much creative human input that the computer isn't actually having to do very much.

I wouldn't say so. Perhaps to get the specific grammatical structure correct, sure. But I think after a point, you've written a program that can write on it's own, without relying on humans.

Again, it boils down to, at what point do you distinguish a program from it's creator?