I'm curious what the earliest instance of a type foundry paying a designer royalties instead of just paying a one-time fee for ownership of a design? The earliest date I know of was a seemingly strange and unique deal in 1928 for Ludlow Ultra Modern. Where any of the name-brand Barnhart faces done with a royalty deal? Or maybe some Goudy faces?
Also, when the did the practice of paying a one-time fee for ownership die out? Was the shift to digital type? Or maybe internet distribution? Is anyone still buying designs from third parties outright?