Microsoft SQL Server 2005 Reporting Services

SSRS uses role-based security in a similar fashion as Windows itself. Roles are groups of tasks. SSRS contains two different types of taskssystem-level tasks and item-level tasks. Item-level tasks are actions that affect the catalog, such as View or Browse. System-level tasks are actions that can be taken on items outside the catalog, but are global in Report Server scope such as shared schedules.

The combination of principal, item, and role is called a policy. Every item in the catalog can either have a policy defined for it explicitly or will inherit the parent item's policy.

If the built-in roles do not suffice, the administrator is free to make his own.