They're a consulting shop, so it would be natural to say that people who leave don't share in the future profits. For your idea where considerable income is ex

They're a consulting shop, so it would be natural to say that people who leave don't share in the future profits. For your idea where considerable income is expected to come from past work, I'd say it makes more sense to have ownership of the app assigned to an ad-hoc company that owns just the app, owned by the people there at the time the app was written. The coöp might take a hand in marketing the app and performing other administrativa, in which case it would collect a fee from each sale. App_1_Co is owned by A, B, C, D and owns App_1. App_2_Co is owned by A, C, E, F and owns App_2. Coöp_Co is owned by C, E, F, G and sells App_1 and App_2 (taking a 10% cut) as well as providing consulting services.