a16z-contracts

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:

TODO: update these to 6

• Creator Retention (“CR”) – Full non-exclusive commercial rights granted, with no hate speech revocation.

• Creator Retention with Hate Speech Revocation (“CR-HS”) – Full non-exclusive commercial rights granted, with hate speech revocation.

• Exclusive Rights with No Creator Retention (“ER”) – Full exclusive commercial rights granted, with no hate speech revocation.

Usage

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

enum LicenseVersion {
    CB_CC0,
    CB_ECR,
    CB_NECR,
    CB_NECR_HS,
    CB_PR,
    CB_PR_HS
}

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

import {LicenseVersion, CantBeEvil} from "@a16z/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 method.

contracts/examples/MyToken.sol

An example NFT contract that inherits CantBeEvil.