LOS ANGELES (AP) - Usually it's an artist who gets hauled into court to defend his work against those who claim they might have stolen it from others. But in this case, Robin Thicke is taking the initiative in running to court. The singer has asked a federal judge to rule that his number-one hit "Blurred Lines" doesn't rip off elements of two other songs. Thicke and producer Pharrell Williams went to court to head off a claim by owners of copyrights to Marvin Gaye's "Got to Give It Up" and George Clinton's "Sexy Ways." Thicke's lawsuit says the owners of those copyrights have warned Thicke and Williams that they plan to claim Blurred Lines used parts of those songs.