A certain north of England genuine businessman, running a tour company and a cyber squatting business decided to put some pictures of Mickey Mouse on his Website to help sell his trips to Disneyland or some such. The mighty Disney came down on him like a ton of bricks and without delay started the most expensive and ruinous legal action for breach of copyright. The said businessman liquidated his company immediately and divested himself of the proceeds in favour of some compliant relatives. A lot of trouble and heartache for pinching a couple of web images.
Certain companies can be most aggressive in protecting their copyright. Even changing the image slightly (say giving Mickey four fingers and altering the colours somewhat) could still attract the lawyers as they could maintain that the new image was an attempt to fool the public into thinking it was the real thing, and so "passing off" as the copyright item.
It seems to me that as the nice folk in Big Business have invested so many of their shiny pennies in their product and promotional material (in the case of Mickey, HE is the product) they are prepared to line their lawyer's pockets with your money in protecting their right to use their material as exclusively as they wish.