A FIDL handle represents a unique capability in some system, usually the Zircon kernel. Handle rights are a FIDL-legible enumeration of the privileges that capability carries with it - for instance, whether or not the resource the handle represents may be written to, inspected, signalled, and so on.

Rights are validated at encode and decode time, ensuring that a given handle carries the set of privileges the interface author allotted for it.

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