A top-performing student sells their beautifully handwritten revision notes for a difficult course (e.g., organic chemistry or law). Problem: Buyers could copy, resell, or claim the notes as their own. Solution: The student creates a PDF of their notes, registers it on a blockchain, and issues a limited number of NFT (Non-Fungible Token) licenses. Each buyer receives a verified PDF. Anyone can check the blockchain to see the original creator and timestamp.