Yup. In Europe you don't copyright "ideas" but expressions of them. If a whistle a song and you make a song out of it and sell millions of copies, then I can't

Yup. In Europe you don't copyright "ideas" but expressions of them. If a whistle a song and you make a song out of it and sell millions of copies, then I can't claim anything. Now, if I have a sheet of music with that tune written on it, that predates your own version, then I win. That's made to ensure that ideas are free to flow. That's very good for auhtors (and society in general, as far as I'm concerned)