Big business - still doing whatever the hell they want and getting away with it

I came across this shocking tidbit of info on trademark infringement on Chilling Effects.

There is another type of infringement, too, called trademark dilution. Under this doctrine, the owner of a famous mark is entitled to stop you from commercial use of a mark or trade name, if that use begins after the famous mark has become famous and harms its distinctive quality. Walt Disney has used this concept to stop pornographers from using Snow White or Sleeping Beauty in their films. Fan fiction authors who distribute their work commercially may be accused of trademark dilution in addition to other intellectual property violations.

Uh, wait a minute. A large corporation can just up and trademark something in public domain under the guise that they are the one that made it famous? Riiiiight.