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A capability is a set of access rights granted to a subject, often transferable. Capabilities are a method for access control.
3
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What is the practical difference between MAC and Capabilities
Capabilities (as implemented in L4RE) requires individual programs or services to explicitly state their needs for resources (memory, processing, I/O) and which programs of services are allowed access. … The communication channel between processes is monitored and access through IPC is allowed or declined based on which program the sender and reciever of the message belong to and what capabilities each …