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Scram is a flexible authorization system which is based on a hierarchy representing abilities to perform actions.

• Holder: This is a module representing anything which can hold Policies. We leave a group system (or having individual users contain policies) up to the user of Scram.
• Policy: A policy groups together many Targets
• Target: Defines a list of actions which can be performed in the context of the Policy model (if applicable). Uses a hash of conditions with keys of comparators and values of hashes representing fields and compare values. Allows special values like @holder to compare against the current holder. Keys can point to model-defined conditions by prefixing keys with @.