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What we know so far: A market built for libraries and booksellers is now feeding AI training, as companies seek large volumes of printed books that predate the generative AI boom. ISBNdb, which says it maintains the world's largest book database, now helps AI companies source physical books in bulk. The company says it can coordinate purchases ranging from 1,000 to 1 million books, drawing from secondary markets where libraries, retailers, and individuals sell used inventory.
Its pitch is simple: older books offer cleaner data. "The world's best AI training data is sitting on a shelf," the company says on its website. "Books represent curated, peer-reviewed, domain-specific human knowledge, structured in a way no web crawl can replicate. Dense, edited, authoritative."
The focus is largely on books published before 2022, before synthetic text became widespread online. That matters because AI models trained on AI-generated content can degrade over time, a problem often referred to as model collapse. ISBNdb frames print as a way around that risk. "Print books from the pre-LLM era are structurally guaranteed to be free of this contamination," the company says. "Physical books published before this date [pre-2022] are structurally clean of modern poisoning tools."
