>They're free to look at the approach and simply rewrite it. If by "look at the approach" you mean the "look at the code", then no. You're giving a step for yo

>They're free to look at the approach and simply rewrite it. If by "look at the approach" you mean the "look at the code", then no. You're giving a step for your code to be considered a derivative work. If by "look at the approach" you mean someone read the code, made a specification, and then someone else that hasn't looked the code, made a program based on the specification, then yes. But arguably this isn't "simply rewrite". Those aren't even baseless considerations. ReactOS project had paused development due to concerns that derived (read: rewritten) parts of leaked Windows code may have been used. It took years for ReactOS to show that everything was in fact a clean-room implementation (basically doing what wrote above). If they hadn't, they'll have made themselves open to be sued by Microsoft.