Three years after their last spat, Eminem is back bad-rapping Apple, alleging that the iPod maker is violating copyright by selling his music through iTunes.

Eminem's music publisher and copyright manager, Eight Mile Style and Martin Affiliated, claim Apple isn't permitted to sell music by the artist because Eminem has not agreed to grant his label, Universal, the rights to sell such music.

Apple's deal is with Universal Music. Under that deal the company pays Universal a substantial slice of the money earned through iTunes sales.

However, Apple has been asked to stop selling Eminem's tracks and has so far refused, the report explains.

Eminem's management previously sued Apple in 2004 over the use of Eminem song Lose Yourself in an iTunes TV ad. The ad was never actually aired.

Read the full story on Macworld.