Just so I have this out of the way: I know the GPL isn't compatible with typical App stores, like Apple's. I understand that the LGPL likely isn't either. I also understand that BSD and Apache licenses are, but I'm wondering - are there licenses out there that cover the middle ground between the two? Basically, something that requires someone who reuses a piece of work to publish the source code, except the bits that they have as part of their agreement with their app store vendor (signing/encryption keys) and such?