Why are we all talking like corporate copyright lawyers or marketing ghouls, using these explicitly commercial terms 
I'm disappointed by the ease at which "IP" rolls off my tongue. I mean, most of the fiction and entertainment we surround ourselves with are more soulless corporate slop than art, but still
i like referring to the more repugnant slop as "IP" because it adds a little fart into the room where people believe any of it is being squeezed out for artistic merit.
if it's something i like, i say "universe", "mythos" or "by the same people as [x]"