Document owner with RO access???

In the VaultAdmin, on the "Lifecycle" tab, there is an option "Document owner with RO access" in the "Change Status" group.  The help file isn't very helpful, but I was thinking about this...

The RO access has nothing to do with the files in my local view, so...

How can somebody with RO access take ownership of a file?  I tried in the vault, and I couldn't.

SolidworksWorkgroup Pdm