I would like to bring an existing boardgame onto the iPad. The owner of the boardgame and the idea behind the game is positive for negotiations and asked me to find out what a fair market / revenue share would be.
So I am asking this forum. If the owner invented the game (some 20 years ago), published it as a boardgame and "lends" me his idea. I will pay for the development, all changes that might need to be done due to the constraints on such a device and all enhancements are done by myself.
What would be a fair share for the copyright owner? 10%? 15%? More?
The development costs will probably be around $15-$20k, the game is not published by a large company and the owner of the copyright is a private person. My marketing efforts will probably be around $2k, also paid by me.
So far I consider a lifelong revenue split and no sole right for me to distribute the principle on the iPad. I haven't thought about re-negotiations to be honest but it sounds like a fair thing in combination with negotiations about the future of the game.
You would probably look at structuring the agreement as a royalty payment for use of the inventors IP. There is no "fair price" save for what you agree between you.
In order to work through the options between you could consider the following variables.
Another consideration for your discussion. Ongoing contribution. Successful iPad / iPhone games have new versions written ... is there value in including the original inventor of the game in these ... IE is their continued participation likely to be required? If so then working out with them either a larger percentage on the agreement they will help build more ... OR an agreement that you will engage them on the next versions and share those again.
Does that help?