proxy1100 / a16z-contracts

a16z Contracts is a library for solidity contracts, including licenses

a16z Contracts

A repository for contracts written by a16z.

CantBeEvil License

The purpose of this repository is to provide an on-chain representation of the CantBeEvil license.

The CantBeEvil license is made available as a contract that can be inherited by any other contract.

There are six variants of the CantBeEvil license:

1. CC0 (“CBE-CC0”) – All copyrights are waived under the terms of CC0 1.0 Universal developed by Creative Commons.
2. Exclusive Commercial Rights with No Creator Retention (“CBE-ECR”) – Full exclusive commercial rights granted, with no hate speech termination. Creator does not retain any exploitation rights.
3. Non-Exclusive Commercial Rights (“CBE-NECR”) – Full non-exclusive commercial rights granted, with no hate speech termination. Creator retains exploitation rights.
4. Non-Exclusive Commercial Rights with Creator Retention & Hate Speech Termination (“CBE-NECR-HS”) – Full non-exclusive commercial rights granted, with hate speech termination. Creator retains exploitation rights.
5. Personal License (“CBE-PR”) – Personal rights granted, without hate speech termination.
6. Personal License with Hate Speech Termination (“CBE-PR-HS”) – Personal rights granted, with hate speech termination.

Installation

Install the Cant Be Evil License smart contracts in your hardhat project:

npm i @a16z/contracts

Usage

The license versions are represented on-chain as an enum.

enum LicenseVersion {
    CBE_CC0,
    CBE_ECR,
    CBE_NECR,
    CBE_NECR_HS,
    CBE_PR,
    CBE_PR_HS
}

Pass the desired version into the CantBeEvil constructor, as shown:

import {LicenseVersion, CantBeEvil} from "@a16z/contracts/licenses/CantBeEvil.sol";

contract MyContract is CantBeEvil(LicenseVersion.CC0) {
    ...
}

You can now call MyContract.getLicenseURI(), which will return an Arweave gateway link to the license text file.

MyContract.getLicenseURI() // => "https://arweave.net/d2k7..."

contracts/licenses/CantBeEvil.sol

This contract is meant to be inherited by NFT contracts and any contract that wishes to expose the getLicenseURI and getLicenseName methods.

contracts/examples/MyToken.sol

An example NFT contract that inherits CantBeEvil.