simple NFT with license mapping for each token Id

FERC721.sol

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.8.4;

import "https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC721.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";

contract FERC721 is ERC721("FERC721", "FERC"), Ownable {
    string public baseURI;

    mapping(uint256 => bytes32) public licenses;

    constructor(string memory baseURI_) {
        baseURI = baseURI_;
    }

    function mint(
        address to, 
        uint256 id, 
        bytes32 license
    ) public onlyOwner virtual {
        _safeMint(to, id);

        licenses[id] = license;
    }

    function tokenURI(uint256) public view override virtual returns (string memory) {
        return baseURI;
    }
}

dope