In the form of a royalty check for every unit sold.
Last month it became clear that Infiniti is serious about using the Eau Rouge name for the production version of the concept, also called the Eau Rouge. Turning the Q50 into a super sedan wasn't really all that hard – it just required the Nissan GT-R's 560-hp twin-turbo 3.8-liter V6 and various other modifications. The world loved the Q50 Eau Rouge Concept and instantly wanted to see it built. Infiniti obliged. It filed an application with the US Patent and Trademark Office to own the "Eau Rouge" name.
There's no word on the exact progress with that, but another issue has risen for the Japanese automaker. The Spa-Francorchamps circuit in Belgium wants royalty payments from Nissan/Infiniti for use of the Eau Rouge name. Eau Rouge just so happens to be the name of one particular, very dangerous and fast uphill bend on the circuit. If Infiniti still decides to go with "Eau Rouge," it's looking very likely it'll be forced to pay the track's owners for every Q50 Eau Rouge sold. Nothing has been made public just yet, but we've been waiting for an official announcement confirming Q50 Eau Rouge production. Perhaps Infiniti and track officials are still working out the terms of a deal.