@effAlong similar lines, you *should* be able to say "Dungeons & Dragons" when identifying products compatible with D&D, but TSR (the original owners) came down hard on people back in the day for daring to release D&D-compatible stuff they didn't control. Third-party publishers were generally way, way too small and poor to be able to afford to fight a completely winnable legal battle, and people who shared "netbooks" or character sheets online were even less capable.1/3