[badsectoracula]

As mentioned by the other comment, the difference lies in how much human effort was put - something by its nature is not possible to ask in a black and white manner that applies everywhere. But in cases which are close to the extremes, it is easy to answer: even though the Toy Story renders are machine output, these renders are the result of a lot of human effort by the human artists that made the 3D scenes, materials, models, animation sequences, etc for the purpose of being used in those renders. So Disney can claim copyright on that sort of "machine output".

Similarly, claiming copyright on AI output is like claiming copyright on something like `init_state(42, &s); for (int i=0; i < count; i++) output[i] = next_random(&s);`. While there is a bit of (theoretical) effort involved into choosing 42 as a starting input, ultimately you can't really claim copyright on a bunch of random numbers because you chose the initial seed value.

Of course you can claim copyright in the code, but doing the same on the output makes no sense: even the if the idea of owning random numbers isn't absurd enough, consider what would happen if -say- 10000 people did the same thing (and to make things even more clear, what if `init_state` used only 8bits of the given number, therefore making sure that there would be a lot of people ending up with the same numbers).

AI is essentially `init_state` and `next_random`, just with more involved algorithms than a random number generator.