How did you read it?

Did you access it where it was illegally posted online?

And in so doing, copy it locally in order to read it?

Guess what? According to copyright laws in the US, you just committed copyright infringement.

There's two separate claims.

One, that training is infringement, will hopefully be found to be without merit or it's a slippery slope to the death of free use.

The other, that OpenAI committed copyright infringement by downloading pirated books, is not special in any way with the AI stuff. It doesn't matter how they used it. If they can be found to have downloaded it - even if they then never even opened the file - they are liable for civil damages that can be as high as $150,000 per work if they knew in advance that they were pirating it, and not less than $100 per work no matter if they knew or not.

This is the result of years of lobbying by the various digital rights owners over the past few decades. It's a very broad scope of law and OpenAI should rightfully be concerned if they didn't actually purchase the copyrighted material they used to train.

You can learn and share the knowledge from a book I might illegally upload, but if you are caught having made a copy of the pirated textbook I uploaded, you are liable for damages completely separate from what you did with the knowledge from the books.