What is the relationship between inheritanceflags and propagationflags in security.accesscontrol?

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I've been doing some work that involved a FileSystemAccessRule and get horribly confused by the InheritanceFlags and PropagationFlags. When I read the help descriptions one way, the PropagationFlags seem redundant. When I read them another way, they seem contradictory to the InheritanceFlags. What do the three values of PropagationFlags mean in a practical sense?

What I have tried:

I've read the MSDN help several times and looked at examples posted for questions regarding the FileSystemAccessRule. Most use PropagationFlags.None, but none say why.

Posted 29-Jan-19 7:51am

John Whitmire

Updated 29-Jan-19 8:11am

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Gerry Schmitz · Answer 1 · 2019-01-29T08:11:00

Inheritance (in this case) implies a dynamic binding to properties higher up in the hierarchy; whereas propagated implies values that have been added or updated in each instance.

Changing an inherited value implies all inheritors automatically "see" that change when it's made; propagation implies an "update" of all candidates.

A further implication is that inherited values are the same for all (i.e. read-only at the instance level); individual propagated values can be changed on each instance that has that property.

No memory need be reserved for inherited; whereas each instance needs a slot for a propagated value.