The wood tends to have an impression of the hammer that hits it. The book isn't in there, the weights are just shaped by what tools were used to form it.
When large quantities of source material are replicable by prompting its a bug not a feature.
>The LLM Wouldnt be here without the copyrighted works
Google wouldn't be here if it hadn't scraped every copyrighted website and used them to form a searchable graph of the internet but we only hear complaints about them when they reproduce entire news articles.