ld.so(8) need clarification

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Hi,
In ld.so(8), when explaining whether a process is in the so-called
"secure execution mode", there are three circumstances:

   *  The process's real and effective user IDs differ, or the real and
      effective group IDs differ.  This typically occurs as a result of
      executing a set-user-ID or set-group-ID program.

   *  A process with a non-root user ID executed a binary that conferred
      permitted or effective capabilities.

   *  A nonzero value may have been set by a Linux Security Module.

I am confused with the second circumstance. What does it mean by
"confer permitted or effective capabilities"?

Yubin
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