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Conventional approaches to access-control, such as ACLs, do not scale well enough for distributed systems. Capabilities on the other hand offer scalability and adaptability advantages in large-scale distributed environments due to their being held and managed by the system's users/agents rather than by the middleware. However the structure of capabilities is only able to provide simple sequence-independent rights-based control, which precludes most forms of composition of actions. If required,doi:10.1037/e605112012-002 fatcat:vshx7swl4jfnldvziys2tvykvm