> For the complete documentation index, see [llms.txt](https://docs.ariaprotocol.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ariaprotocol.xyz/technical-docs/contract-docs/legal/interfaces/ilicense.md).

# ILicense

## Functions

### signLicense

Allows a user to sign the current license.

```solidity
function signLicense(bytes calldata signature) external;
```

### contentURIHash

Returns the hash of the current license URI.

```solidity
function contentURIHash() external view returns (bytes32);
```

### licenseURI

Returns the URI of the current license.

```solidity
function licenseURI() external view returns (string memory);
```

### licenseURIOf

Returns the URI of a specific license version.

```solidity
function licenseURIOf(uint256 version) external view returns (string memory);
```

### licenseVersion

Returns the current license version.

```solidity
function licenseVersion() external view returns (uint256);
```

### hasSignedCurrentLicense

Returns true if the account has signed the current license version.

```solidity
function hasSignedCurrentLicense(address account) external view returns (bool);
```

## Events

### LicenseSigned

Emitted when an account signs a license version.

```solidity
event LicenseSigned(address indexed account, uint256 indexed version);
```

### LicenseURIUpdated

Emitted when a new license URI is set.

```solidity
event LicenseURIUpdated(uint256 indexed version, string indexed uri, bytes32 indexed contentHash);
```

### LicenseSignatureRevoked

Emitted when a license signature is revoked.

```solidity
event LicenseSignatureRevoked(address indexed account, uint256 indexed version);
```

## Errors

### License\_\_AlreadySigned

```solidity
error License__AlreadySigned();
```

### License\_\_InvalidURI

```solidity
error License__InvalidURI();
```

### License\_\_NotSigned

```solidity
error License__NotSigned();
```

### License\_\_NoLicenseToSign

```solidity
error License__NoLicenseToSign();
```

### License\_\_SignatureNotFound

```solidity
error License__SignatureNotFound();
```

### License\_\_InvalidSignature

```solidity
error License__InvalidSignature();
```


---

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