I was talking with a couple of friends the other day when a thought hit me: In Kick-Ass, an awesome movie based on a non DC Universe comic book license, both Batman and Superman are mentioned. It got me thinking, what are the rules governing the mentioning of other trademarks within movies and TV shows? Could the next Superman movie show Clark Kent wearing Spider-Man underwear? Does it depend on whether or not Marvel would object to that or is there actually well established rules and regulations regarding this?
