That's a really novel idea. But I suppose it would all depend on how modular the codebase is. If there's any doubt about where Adobe's code ends and company X's

That's a really novel idea. But I suppose it would all depend on how modular the codebase is. If there's any doubt about where Adobe's code ends and company X's code begins you'd be back to square one-- especially given that company X could easily exploit any ambiguity to scare hobbyist developers from an effort to fill in the stubs.