Kemosabe will become Sony’s fourth label division, with Dr. Luke reporting directly to Mr. Morris. The label is expected to become operational in January, and Dr. Luke will have free rein to hire staff members and sign artists. One trade-off: because he can now produce only Sony artists, Dr. Luke will not be able to work with Ms. Perry, who records for EMI.
Full and extremely tl;dr source
FYI, Dr. Luke produced 5/6 of Katy Perry's #1