A repository for contracts written by a16z.
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:
- CC0 (“CBE-CC0”) – All copyrights are waived under the terms of CC0 1.0 Universal developed by Creative Commons.
- 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.
- Non-Exclusive Commercial Rights (“CBE-NECR”) – Full non-exclusive commercial rights granted, with no hate speech termination. Creator retains exploitation rights.
- 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.
- Personal License (“CBE-PR”) – Personal rights granted, without hate speech termination.
- Personal License with Hate Speech Termination (“CBE-PR-HS”) – Personal rights granted, with hate speech termination.
Install the Cant Be Evil License smart contracts in your hardhat project:
npm i @a16z/contracts
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..."
This contract is meant to be inherited by NFT contracts and any contract that wishes to expose the getLicenseURI
and getLicenseName
methods.
An example NFT contract that inherits CantBeEvil
.