Add permissions for the IPA registry to call linkParentToIp in the licensing module

[leeren]

This change ensures that the IPA registry has permissions to call the licensing module's linkParentToIp function, so that when users perform derivative registration via the IPA registry, the registry will be allowed to link the derivative IPA to its parent.

[LeoHChen]

what does it mean by permissionless remixing?

[leeren]

what does it mean by permissionless remixing?

As in, just like how anyone can call the IPA registry to register their IP, anyone should be able to call the IPA registry to register their IP as a derivative. Until now, we've solely relied on the registration module for doing all of this (which will be phased out at a later point in time), but the idea is that the IPA registry is permissionless and users should be able to do the same by calling the registry directly. I updated the language to make it clearer.

[LeoHChen]

what does it mean by permissionless remixing?

As in, just like how anyone can call the IPA registry to register their IP, anyone should be able to call the IPA registry to register their IP as a derivative. Until now, we've solely relied on the registration module for doing all of this (which will be phased out at a later point in time), but the idea is that the IPA registry is permissionless and users should be able to do the same by calling the registry directly. I updated the language to make it clearer.

Not sure if we allow anyone to register their IP as a derivative. I think this breaks our ip graph creation and licensing requirement. I would hold this PR.

[jdubpark]

We are now allowing IPAssetRegistry to call into LicensingModule for linkIpToParents, previously only allowed for RegistrationModule. As long as you (child) own the licenses, it can now call through either IPAssetRegistry or RegistrationModule to link to a parent.

LicensingModule does the permission check

function linkIpToParents(
    uint256[] calldata licenseIds,
    address childIpId,
    bytes calldata royaltyContext
) external nonReentrant verifyPermission(childIpId) { ... }