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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.

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Use of S/MIME capabilities attribute

If you examine an S/MIME-signed file with $ openssl cms -in file.sgn -noout -cmsout -print you see that S/MIME capabilities are also included in the signature: ... … A client does not have to list every capability it supports, and probably should not list all its capabilities so that the capabilities list doesn't get too long. …