# Auxiliary Contracts

* [**DimoAccessControl**](https://docs.dimo.org/protocol/identity-protocol/auxiliary-contracts/access-control): management of function access and roles.
* [**AdLicenseValidator**](https://docs.dimo.org/protocol/identity-protocol/auxiliary-contracts/adlicensevalidator): validates manufacturer license for minting aftermarket devices.
* [**Eip712Checker**](#eip712checker): signature verification.
* [**Mapper**](https://docs.dimo.org/protocol/identity-protocol/auxiliary-contracts/mapper): helps to establish links between nodes.