Is a book publicly available? No, you have to purchase it. But once you do, you're legally allowed to let your friends and family and so forth read it too. As long as you don't sell copies of it (the "copy" part of "copyright"), or meaningfully take away the ability for the publisher to make money from sales (so you can't post it for the whole world to see on the internet).
And sure, there are lots of ToS for digital works, but are they actually enforceable? ToS can say you're not allowed to let anyone else read the book you purchased. But no court is going to say you can't lend your Kindle to your friend for them to read it too. Many ToS clauses are flat-out illegal.
Meta will argue that training on books is no different from reading all the books at a friend's house. That as long as Meta isn't reselling or making publicly available the original text, they're in the clear.
This means that it's not legal to download a rip of e.g. a CD that was uploaded without consent, even if you own a copy.
(This exception to the general right to make copies for private use was added in 2005 to make downloading illegal -- previously, only uploading was infringing.)
I would assume just the act of downloading this content was illegal in the relevant US jurisdictions as well.
What do you think copyright law(suits) would do if a regular person made copies of every book and movie and song they saw, placing the duplicate media in a room of their house?
IMO there's a hack about this,
authors can claim that they allow for public use unless it's used for training LLMs. And all of training work would fall under 2 because they would be used against the copyright.
If I go to the bookstore, buy the book, make a scan, and train an LLM with it, how would you enforce your license as an author? The customer never knew that he shouldn’t have been allowed to train LLMs.
Edit: I think I misunderstood the original comment, I thought the idea was to sell books and restrict use for LLM training. If we’re only talking about stuff that’s publicly released, the restriction should be possible.
Whether the shop makes a scan should not affect you as the buyer of the actual book. What does the scan have to do with you?
Whether the author learns about that scan and perhaps training of some LLM using the scan or not, does not change the legality of it.
There is nothing of value that the license gives me that I wouldn't already have if the contract didn't exist. I can already read the book, merely by having it in front of me.
Or are we talking about training an LLM on it and never releasing that LLM to anyone ever? Then I guess it wouldn't matter. But if that LLM is released to anyone, shouldn't the author of the book have a say on it?
Fair use gives me that right, not a contract or license.
But ... as I've thought about it more, it doesn't really feel just to me. The kind of value reaped from the works seems to suggest that the creator is due some portion of that value. Also, in practice - there's just an absolutely enormous amount of knowledge that can be consumed from the public domain. Even if Meta, OpenAI and friends decided to license a ~small handful of the long-term archives of some globally-read newspapers, they could get very broad and deep knowledge about the events, trends, terms of the last century to fill in a lot of gaps.
This is distinct from (1) where the content is streamed or only ephemeral/incidental copies are made.
1.) Training on copyright that is publicly available. You write a poem and publish it online for the world to read. That is your IP, no one else can take it an sell it, but they are free to read and be inspired by it. The legalitly of training on this is in the courts, but so far seems to be going in favor of LLMs.
2.) Training on copyright that is not publicly available. These are pretty much pirated works or works obtained by backdoor to avoid paying for them. Your poem is behind a paywall and you never got paid, yet the poem is known by the LLM. This is just straight illegal, as you legally must pay to view the work. However there might be conditions here too like paying for access to an archive and then training on everything in it.