A 17-year-old student and a 23-year-old unemployed man allegedly used Trojan viruses to hack into the artists’ computers for about 12 months before being discovered, Duisburg chief prosecutor Rolf Haferkamp said. During that time, they earned more than €10,000 ($13,240) in illegal sales of tracks acquired from the stars’ computers.

The student, an amateur DJ known as “DJ Stolen,” also allegedly downloaded a compromising photo of one artist and used it to blackmail her. Haferkamp would not comment on which artist it was.