The RoyaltyPolicyLRP (Liquid Relative Percentage) contract defines the logic for splitting royalties for a given IP asset using a liquid relative percentage mechanism. It manages the royalty relationships between IP assets and their ancestors, allowing for the transfer of revenue tokens to the appropriate royalty vaults.

​
State Variables

​
RoyaltyPolicyLRPStorage

struct RoyaltyPolicyLRPStorage {
    mapping(address ipId => uint32) royaltyStackLRP;
    mapping(address ipId => mapping(address ancestorIpId => uint32)) ancestorPercentLRP;
    mapping(address ipId => mapping(address ancestorIpId => mapping(address token => uint256))) transferredTokenLRP;
}

Storage structure for the RoyaltyPolicyLRP containing:

  • royaltyStackLRP: Sum of the royalty percentages to be paid to all ancestors for LRP royalty policy
  • ancestorPercentLRP: The royalty percentage between an IP asset and a given ancestor for LRP royalty policy
  • transferredTokenLRP: Total lifetime revenue tokens transferred to a vault from a descendant IP via LRP

​
IP_GRAPH

address public constant IP_GRAPH = address(0x0101)

The address of the IP Graph precompile contract that tracks relationships between IPs.

​
ROYALTY_MODULE

IRoyaltyModule public immutable ROYALTY_MODULE

The address of the Royalty Module contract.

​
ROYALTY_POLICY_LAP

IGraphAwareRoyaltyPolicy public immutable ROYALTY_POLICY_LAP

The address of the RoyaltyPolicyLAP contract.

​
IP_GRAPH_ACL

IPGraphACL public immutable IP_GRAPH_ACL

The address of the IP Graph Access Control List contract.

​
Functions

​
constructor

constructor(address royaltyModule, address royaltyPolicyLAP, address ipGraphAcl)

Constructor for the RoyaltyPolicyLRP contract.

Parameters:

  • royaltyModule: The RoyaltyModule address
  • royaltyPolicyLAP: The RoyaltyPolicyLAP address
  • ipGraphAcl: The IPGraphACL address

​
initialize

function initialize(address accessManager) external initializer

Initializer for this implementation contract.

Parameters:

  • accessManager: The address of the protocol admin roles contract.

​
onLicenseMinting

function onLicenseMinting(
    address ipId,
    uint32 licensePercent,
    bytes calldata
) external nonReentrant onlyRoyaltyModule

Executes royalty related logic on minting a license.

Parameters:

  • ipId: The ipId whose license is being minted (licensor)
  • licensePercent: The license percentage of the license being minted

​
onLinkToParents

function onLinkToParents(
    address ipId,
    address[] calldata parentIpIds,
    address[] memory licenseRoyaltyPolicies,
    uint32[] calldata licensesPercent,
    bytes calldata
) external nonReentrant onlyRoyaltyModule returns (uint32 newRoyaltyStackLRP)

Executes royalty related logic on linking to parents.

Parameters:

  • ipId: The children ipId that is being linked to parents
  • parentIpIds: The parent ipIds that the children ipId is being linked to
  • licenseRoyaltyPolicies: The royalty policies of the licenses
  • licensesPercent: The license percentage of the licenses being minted

Returns:

  • newRoyaltyStackLRP: The royalty stack of the child ipId for LRP royalty policy

​
transferToVault

function transferToVault(
    address ipId,
    address ancestorIpId,
    address token
) external whenNotPaused returns (uint256)

Transfers to vault an amount of revenue tokens claimable via LRP royalty policy.

Parameters:

  • ipId: The ipId of the IP asset
  • ancestorIpId: The ancestor ipId of the IP asset
  • token: The token address to transfer

Returns:

  • The amount of revenue tokens transferred
function getPolicyRtsRequiredToLink(address ipId, uint32 licensePercent) external view returns (uint32)

Returns the amount of royalty tokens required to link a child to a given IP asset.

Parameters:

  • ipId: The ipId of the IP asset
  • licensePercent: The percentage of the license

Returns:

  • The amount of royalty tokens required to link a child to a given IP asset (always 0 for LRP)

​
getPolicyRoyaltyStack

function getPolicyRoyaltyStack(address ipId) external view returns (uint32)

Returns the LRP royalty stack for a given IP asset.

Parameters:

  • ipId: The ipId to get the royalty stack for

Returns:

  • Sum of the royalty percentages to be paid to all ancestors for LRP royalty policy

​
getPolicyRoyalty

function getPolicyRoyalty(address ipId, address ancestorIpId) external returns (uint32)

Returns the royalty percentage between an IP asset and its ancestors via LRP.

Parameters:

  • ipId: The ipId to get the royalty for
  • ancestorIpId: The ancestor ipId to get the royalty for

Returns:

  • The royalty percentage between an IP asset and its ancestors via LRP

​
getTransferredTokens

function getTransferredTokens(address ipId, address ancestorIpId, address token) external view returns (uint256)

Returns the total lifetime revenue tokens transferred to a vault from a descendant IP via LRP.

Parameters:

  • ipId: The ipId of the IP asset
  • ancestorIpId: The ancestor ipId of the IP asset
  • token: The token address to transfer

Returns:

  • The total lifetime revenue tokens transferred to a vault from a descendant IP via LRP

​
isSupportGroup

function isSupportGroup() external view returns (bool)

Returns whether the royalty policy supports working with groups.

Returns:

  • True (LRP royalty policy supports working with groups)

​
Internal Functions

​
_getRoyaltyStackLRP

function _getRoyaltyStackLRP(address ipId) internal returns (uint32)

Returns the royalty stack for a given IP asset for LRP royalty policy.

Parameters:

  • ipId: The ipId to get the royalty stack for

Returns:

  • The royalty stack for a given IP asset for LRP royalty policy

​
_setRoyaltyLRP

function _setRoyaltyLRP(address ipId, address parentIpId, uint32 royalty) internal

Sets the LRP royalty for a given link between an IP asset and its ancestor.

Parameters:

  • ipId: The ipId to set the royalty for
  • parentIpId: The parent ipId to set the royalty for
  • royalty: The LRP license royalty percentage

​
_getRoyaltyLRP

function _getRoyaltyLRP(address ipId, address ancestorIpId) internal returns (uint32)

Returns the royalty percentage between an IP asset and its ancestor via royalty policy LRP.

Parameters:

  • ipId: The ipId to get the royalty for
  • ancestorIpId: The ancestor ipId to get the royalty for

Returns:

  • The royalty percentage between an IP asset and its ancestor via royalty policy LRP

​
_getRoyaltyPolicyLRPStorage

function _getRoyaltyPolicyLRPStorage() private pure returns (RoyaltyPolicyLRPStorage storage $)

Returns the storage struct of RoyaltyPolicyLRP.

Returns:

  • The storage structure for the RoyaltyPolicyLRP

​
_authorizeUpgrade

function _authorizeUpgrade(address newImplementation) internal override restricted

Hook to authorize the upgrade according to UUPSUpgradeable.

Parameters:

  • newImplementation: The address of the new implementation

​
Events

​
RevenueTransferredToVault

event RevenueTransferredToVault(address ipId, address ancestorIpId, address token, uint256 amount)

Emitted when revenue tokens are transferred to a vault.

Parameters:

  • ipId: The ipId of the IP asset
  • ancestorIpId: The ancestor ipId of the IP asset
  • token: The token address transferred
  • amount: The amount of tokens transferred

​
Security Considerations

The RoyaltyPolicyLRP contract implements several security measures:

  1. Access Control: Functions like onLicenseMinting and onLinkToParents can only be called by the Royalty Module through the onlyRoyaltyModule modifier.

  2. Reentrancy Protection: The nonReentrant modifier is used on functions that handle token transfers to prevent reentrancy attacks.

  3. Pausability: The contract can be paused in emergency situations using the whenNotPaused modifier.

  4. Safe Token Transfers: The contract uses OpenZeppelin’s SafeERC20 library to ensure safe token transfers.

  5. Upgradability: The contract is upgradable using the UUPS pattern, with upgrade authorization restricted to the protocol admin.

  6. Input Validation: The contract validates inputs and checks for edge cases, such as preventing transfers between the same IP.

​
Royalty Dilution Considerations

The LRP (Liquid Relative Percentage) royalty policy allows each remixed IP to receive a percentage of the revenue generated by its direct derivatives. However, it’s important to understand the potential dilution of royalties as more derivatives are created between two IPs.

This dilution can reduce the earnings of the original IP creator as more layers of derivatives are added. For example:

  1. Creator 1 - Registers IP1, mints an LRP license of 10%, and sells the license to Creator 2.
  2. Creator 2 - Registers IP2 as a derivative of IP1 and mints an LRP license of 20% for himself/herself.
  3. Creator 2 - Registers IP3 as a derivative of IP2 and promotes IP3 commercially in the market.

The earnings for Creator 1 are diluted because they will only receive 10% of the 20% royalties from IP3, resulting in an effective royalty of 2%. If Creator 2 had chosen to promote IP2 instead, Creator 1 would have earned 10% directly, avoiding this dilution.

In contrast, the LAP (Liquid Absolute Percentage) royalty policy enforces a fixed percentage on every descendant IP, protecting the original creator from dilution.