{"type": "article", "title": "AI Firms Buying Old Books: The Hidden Cost of Training Data", "publisher": "Web Pulse", "url": "https://wpnews.pro/news/ai-firms-buying-old-books-the-hidden-cost-of-training-data", "original_source": "https://promptcube3.com/en/news/4538/", "published": "2026-07-31T12:23:32+00:00", "accessed": "2026-07-31", "id": "ai-firms-buying-old-books-the-hidden-cost-of-training-data"}