An Access Control Module is a self-contained software component that enforces authorization rules governing which principals may invoke which functions or read which resources. In smart-contract systems it is commonly implemented as a reusable mixin defining roles, ownership, and permission checks that other contracts inherit. It centralizes permission logic so that privileged operations such as timelocked upgrades or rights revocation are gated behind verifiable on-chain conditions.
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- The module typically exposes role definitions, ownership assignment, and modifier-style guards that revert unauthorized calls. In contract suites it is inherited rather than deployed standalone, which keeps permission logic auditable and consistent across functions. Role hierarchies, admin transfer, and emergency pause are common extensions.