What are the rules for using images of famous cartoon characters, okay?

I run a small web site that offers a color in the early childhood program. I've always been very careful to use only those images that are my own creations or have been contributed by users. A Despite a large number of users wanting photos of SpongeBob or Scooby-Doo, or … I stayed away from creating such images do not because I do not want to be sued for breach of copyright. At a time when Disney Corporation tried to contact by email, to ask about this, but did not even bother to respond. Am I being too cautious? Take a look at almost any website that provides coloring and you will see a lot of what I would have thought that owned pictures – Mickey Mouse, 101 Dalmatians, Dora the Explorer, Superman, – whatever. Are copyright violation? And if so why do not big corporations as Nickelodeon Disny and shut?

it is infringing the copyright Disney or Nickelodeon not know is if you do something about it (sometimes by legal issue years to resolve, and during that time are the collection of evidence) No, not to be too cautious, you are acting within the law and not infringe the rights of the characters and the companies that own

FULL Landon Donovan Winning Goal over Algeria FIFA World Cup 2010 (Part 1)

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Drawn to Life $12.47 A dying village embraced by everlasting winter has cried out to you the Creator for assistance. The remaining inhabitants of the village need you to bring back all their lost possessions such as the sun moon fruit trees fish rain clouds plants animals and much more! Players can draw their own characters which then come to life and become playable characters in the game! In Challenge Mode run jump …