>The trick in this case is for the project to have enough momentum so that you want to try and stay in sync with it and not maintain a bunch of your own changes

>The trick in this case is for the project to have enough momentum so that you want to try and stay in sync with it and not maintain a bunch of your own changes. It's not that hard these days, particularly if you are a big company with plenty resources, Apple chose to fork Clang/LLVM so that they could keep their Swift implementation proprietary. >Rails, Node, Android, Go Haven't open source frameworks pretty much always been permissively licensed ? My experience is that applications are typically GPL licensed, meanwhile frameworks and libraries are typically permissively licensed.