Where do the undistributed, "Black Box" royalties go?

“The Black Box” royalties is a growing sum of undistributed and/or undistributable royalties that have been collected on an artist’s behalf, and what happens with it is a hotly debated topic within the industry, as every collection society that has one deals with these unclaimed royalties differently. The Future of What uploaded a podcast about the subject John Simson (American University), Wayne Milligan (TriStar Sports & Entertainment Group) and Steve Ambers (SOCAN).

Episode #177 : Where Do Black Box Royalties Go?