I wish to develop a computer game and the engine I have chosen is ioquake3. This engine is licensed under GPLv2. Needless to say the game's source code will itself will, in turn, be licensed under GPLv2. The game data/assets on the other hand will be proprietary. I intend to release this game as a free-to-play app across various app stores with in-app-purchases for additional game data/assets. What I would like to know is if the code for the in-app-billing logic must also be included in the published GPL'd source?
What is the status of in-app-purchasing code in a GPLv2 app? [generic app store]
monetization;gpl 2