There's been discussion from time to time that restoring your own game is OK, but I haven't researched the truth of this claim - might have to do that. Fixing your own game does not cross into the commercial area so the criminal issues of piracy are not of concern. And as for a private action, seems it would be a bit pointless and stupid taking action against a private owner of a pinball machine using artwork to restore the thing (although you never know, owning a right does not equate with being bright).