The seller of the code has no visibility on the training set of the LLM. If the situation you're describing ends up being illegal, responsibility should fall on

The seller of the code has no visibility on the training set of the LLM. If the situation you're describing ends up being illegal, responsibility should fall on the LLM provider to provide tools to detect such overlap with their training sets, and on the clients to run the tools. The provider of the LLM should want to enable this and to take on that responsibility (I mean take it from the clients), otherwise no one will want to use the tool. Maybe there could be AI tool-use lawsuit insurance, but I feel like that's worse than the copyright infringement detection tool for everyone involved. I can see the tool happening in the EU, but nowhere else basically, especially in the US, the government sees "AI dominance" as a national priority and a national security priority.