Update: March 10, 2015
"Blurred Lines" composers Robert Thicke and Pharrell lost the case in court, and the jury order a $7.4 million verdict today. Of course, it is likely to be appealed.
This does not sound good for a lot of musicians, maybe even DJ's. The Atlantic has a piece by Spencer Kornhaber here. On Twitter, I got a comment that the ruling really affects just "samplers", not real composers and songwriters! This seems to get into the area of "derivative works".