FWIW, RPM Fusion has this in it's FAQ for Fedora:
"""
How can I list all installed RPM Fusion Packages
Use a command like this on Fedora:
rpm -qa --qf '%{NAME} %{SIGGPG:pgpsig} %{SIGPGP:pgpsig} \n' | grep -e
855099b249c8885a -e 206f8182b1981b68 -e ad2708448fcff4da -e
4d2a1bdc8dc43844 | awk ' { print $1 } ' | sort
"""
I do like the simplicity of this command. I will probably replicate it.
stahnma