During his long career, Bob Dylan has marched against the Vietnam War, campaigned for the civil rights movement and written progressive anthems that highlight such social blights as poverty, racism, criminality and nuclear proliferation.
Now the voice of a generation faces a battle which may end up leaving him on the wrong side of history. It pits the multi-millionaire pop legend against Rob Oeschle, a middle-aged photography enthusiast from Pennsylvania.
Oeschle, 58, is otherwise known as Okinawa Soba, the owner of an account on the photo-sharing website Flickr.
It emerged last week that several of the paintings in Dylan's latest New York art show were direct copies of pictures from that very feed.
"It's plagiarism, pure and simple," Oeschle told the Independent. "If a writer were to use a phrase from Shakespeare, and not credit him, or attribute it in any way, that's what they'd be accused of. There's an ethic expected of an artist, and Bob Dylan should be good enough to have it."