If the code is being provided as output from an LLM, I don't know that they themselves could even say where the code came from. Attribution might not be possibl

If the code is being provided as output from an LLM, I don't know that they themselves could even say where the code came from. Attribution might not be possible in that case. Similarly, how might one remove say, GPL code from the model, without regenerating from all the rest of the inputs alone?