Allegedly, on or about 05 June 2016, Kevin Cummings sent:
(Sorry, I can't remember where I got them from. "yum list all cnijfilter*" won't tell me anything other than installed, therefore I probably got them directly from Canon.)
If you installed and RPM without using YUM, you ought to be able to: rpm -qa cnijfilter*
Is there anything that trawls through non-user file (i.e. system and applications), that could single out files that weren't installed via RPM, YUM, DNF, etc?
A comparison between yum database and locate database?