Music is hex-data which is complicated to discuss, let's talk about copyrighted code. here's the scenario: What if some deductive programs (like prolog) happen

Music is hex-data which is complicated to discuss, let's talk about copyrighted code. here's the scenario: What if some deductive programs (like prolog) happens to compile another piece of code to your code? First you can't sue a system like prolog (assume the system itself is copyright free) Secondly you can't sue some deductive code since it's totally different thing, which went through some process and happens to be the exact same as your code. A perfect example to make myself clear: http://news.ycombinator.com/item?id=911331 http://news.ycombinator.com/item?id=911331 This applies to music as well. Let's talk about .midi files first. I have a sequence of notes which is still playable music, went through a magical convert formula, and produce the exact same midi as copyrighted ones, which step is liable? In one word, copyright just a label, for a certain static combination of information. And this static state can be generated by infinite alternative legal means, which is why copyright system is ridiculous. The only thing copyrighted in this universe is time. You can't reverse time (at least for now). So copyright is really a moral issue. People are doing you a favor for your copyrighted works' publicity.