Artificial intelligence now sits inside hiring, pricing, diagnostics, vehicles, warehouses, and the practice of law itself, and it activates nearly every field of commercial and professional law at once. This guide maps the terrain issue by issue: protecting AI through patents, copyrights, and trade secrets; who owns what a machine invents or writes after Thaler v. Vidal and Thaler v. Perlmutter; the 2025 training-data copyright rulings and the record Anthropic settlement; products-liability theory for systems that act on their own; biometric exposure under Illinois's BIPA and data-protection duties under the GDPR and the EU AI Act; disparate-impact risk from hiring algorithms under Title VII and the four-fifths rule; the five components hidden inside every AI contract; algorithmic-collusion theory under Section 1 of the Sherman Act; the treatment of AI assets in bankruptcy; and the professional-responsibility duties that ABA Formal Opinion 512 and Mata v. Avianca place on lawyers who use generative tools. It follows one invented company through each doctrine and reflects developments through the November 2025 USPTO inventorship guidance and the late-2025 shifts in EU and U.S. AI regulation.