# Protocols

- [Key Concepts](/1combo/protocols/key-concepts.md)
- [Open IP Protocol](/1combo/protocols/open-ip-protocol.md)
- [NFT Licenses](/1combo/protocols/nft-licenses.md)
- [NFT Derivatives](/1combo/protocols/nft-derivatives.md)
- [NFT Network](/1combo/protocols/nft-network.md)
- [NRC20](/1combo/protocols/nrc20.md)