[[servlet-authorization]]
= Authorization
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The advanced authorization capabilities within Spring Security represent one of the most compelling reasons for its popularity.
Irrespective of how you choose to authenticate (whether using a Spring Security-provided mechanism and provider or integrating with a container or other non-Spring Security authentication authority), the authorization services can be used within your application in a consistent and simple way.

In this part, we explore the different `AbstractSecurityInterceptor` implementations, which were introduced in Part I.
We then move on to explore how to fine-tune authorization through the use of domain access control lists.