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Amazon S3 employs several mechanisms to manage access control, ensuring that data is properly protected while allowing for specific users and services to interact with it as needed. The correct answer regarding which method is not used by Amazon S3 for access control is resource locking.

Bucket policies, IAM policies, and Access Control Lists (ACLs) are all established methods that enable users to grant or restrict access to their S3 buckets and the objects within them. Bucket policies are attached to the buckets themselves and define which actions are allowed or denied and under what conditions, often based on the requester’s identity. IAM policies operate at a broader AWS account level and specify which AWS services the users can access and the actions they can perform. ACLs provide a legacy approach to access management in S3, allowing you to set permissions at both the bucket and object levels based on specific user accounts or groups.

Resource locking, on the other hand, does not pertain to access control in S3. Instead, it typically refers to mechanisms like AWS Resource Access Manager (RAM) or AWS Organizations that help manage resources across accounts, ensuring that specific prohibitions or required states can be enforced, rather than controlling access permissions directly as needed by S3. Thus, it is not a method