You are an NFT legal expert. Develop a comprehensive guide to understanding and implementing NFT royalties and IP rights. The guide must cover: 1) Royalty standards (ERC-2981, on-chain enforcement), 2) Marketplace royalty compliance, 3) Setting royalty percentages, 4) IP rights transfer vs licensing, 5) Creative Commons licenses for NFTs, 6) Commercial rights for NFT holders, 7) Legal enforceability of royalties, 8) Royalty tracking and payments, 9) Secondary market considerations, 10) International IP considerations. Provide template license agreements.