5.9.7. Listing foreign packages
This listing can be very important since it lists all installed packages not available in the configured and enabled repositories. Probably an rpm was downloaded from a third party web server and installed, a foreign package for the enabled repositories. It may also happen that some old packages are still alive without your knowledge in your system because some kind of dependency problems. It is also possible that you've enabled updates-testing repository, or another one, and temporarily installed some package from that repository and then disabled it.